Merge visual audit and GPU workflow upgrade

.mcp.json

@@ -0,0 +1,21 @@
+{
+  "mcpServers": {
+    "higgsfield": {
+      "command": "npx",
+      "args": ["-y", "higgsfield-mcp"],
+      "env": {
+        "HF_API_KEY": "${HF_API_KEY}",
+        "HF_SECRET": "${HF_SECRET}"
+      }
+    },
+    "aistudio": {
+      "command": "npx",
+      "args": ["-y", "aistudio-mcp-server"],
+      "env": {
+        "GEMINI_API_KEY": "${GEMINI_API_KEY}",
+        "GEMINI_MODEL": "gemini-2.5-flash",
+        "GEMINI_TIMEOUT": "600000"
+      }
+    }
+  }
+}

backend/README.md

@@ -142,6 +142,7 @@ bash scripts/live_migration_smoke.sh
   - `GET /api/v1/detection/models`
   - `GET /api/v1/detection/model-assets`
   - `POST /api/v1/detection/run`
+  - `POST /api/v1/detection/run-async` (production browser path)
   - `GET /api/v1/detection/runs/{analysis_run_id}`
   - `GET /api/v1/detection/runs/{analysis_run_id}/detections`
 - YOLO/PyTorch real inference is not enabled in Sprint 8.
@@ -184,6 +185,7 @@ bash scripts/live_migration_smoke.sh
 - Added segmentation endpoints:
   - `GET /api/v1/segmentation/models`
   - `POST /api/v1/segmentation/run`
+  - `POST /api/v1/segmentation/run-async` (production browser path)
   - `GET /api/v1/segmentation/runs`
   - `GET /api/v1/segmentation/runs/{analysis_run_id}`
   - `GET /api/v1/segmentation/runs/{analysis_run_id}/segmentations`
@@ -191,6 +193,11 @@ bash scripts/live_migration_smoke.sh
   - `POST /api/v1/segmentation/runs/{analysis_run_id}/qa/reference`
 - Real SAM and YOLO-seg inference are not enabled in Sprint 9.
 - Mask paths are provenance/debug artifacts; persisted PostGIS geometry is authoritative for QA, map display and GeoJSON.
+- Current configured detection and segmentation run through the async analysis
+  worker (`GEOINTEL_ANALYSIS_WORKER_ENABLED`) and are followed through
+  `GET /api/v1/projects/{project_id}/jobs/{job_id}`. The Unraid profile sets
+  `YOLO_REQUIRE_CUDA=true`, so both pipelines fail closed instead of silently
+  falling back from NVIDIA CUDA to CPU.
 
 ## Sprint 17 additions
 - Added export foundation backed by the existing `exports` table.

backend/app/api/guest_scope.py

@@ -0,0 +1,43 @@
+from __future__ import annotations
+
+from uuid import UUID
+
+from fastapi import Request
+
+from app.core.errors import AppError
+
+
+def guest_project_scope(request: Request) -> UUID | None:
+    principal = getattr(request.state, "auth_principal", None)
+    if getattr(principal, "role", None) != "guest":
+        return None
+    project_id = getattr(principal, "project_id", None)
+    if isinstance(project_id, UUID):
+        return project_id
+    raise AppError(
+        code="GUEST_PROJECT_SCOPE_REQUIRED",
+        message="Deze gastensessie heeft alleen toegang tot de GeoIntel-demowerkruimte.",
+        status_code=403,
+    )
+
+
+def assert_guest_project_scope(request: Request, project_id: UUID) -> None:
+    guest_project_id = guest_project_scope(request)
+    if guest_project_id is not None and project_id != guest_project_id:
+        raise AppError(
+            code="GUEST_PROJECT_SCOPE_REQUIRED",
+            message="Deze gastensessie heeft alleen toegang tot de GeoIntel-demowerkruimte.",
+            status_code=403,
+        )
+
+
+def guest_scoped_project_filter(
+    request: Request,
+    requested_project_id: UUID | None,
+) -> UUID | None:
+    guest_project_id = guest_project_scope(request)
+    if guest_project_id is None:
+        return requested_project_id
+    if requested_project_id is not None:
+        assert_guest_project_scope(request, requested_project_id)
+    return guest_project_id

backend/app/api/routes/detection.py

@@ -2,9 +2,14 @@ from __future__ import annotations
 
 from uuid import UUID
 
-from fastapi import APIRouter, Depends, Query
+from fastapi import APIRouter, Depends, Query, Request
 from sqlalchemy.orm import Session
 
+from app.api.guest_scope import (
+    assert_guest_project_scope,
+    guest_project_scope,
+    guest_scoped_project_filter,
+)
 from app.db.session import get_db
 from app.schemas import (
     AnalysisQaResponse,
@@ -25,6 +30,7 @@ from app.schemas import (
     YoloPreflightResponse,
 )
 from app.services.detection_comparison_service import DetectionComparisonService
+from app.services.dataset_service import DatasetService
 from app.services.detection_service import DetectionService
 from app.services.model_asset_catalog_service import ModelAssetCatalogService
 from app.services.model_registry_service import ModelRegistryService
@@ -60,7 +66,12 @@ def get_yolo_preflight(
 
 
 @router.post("/run", response_model=Envelope[DetectionRunResponse])
-def run_detection(payload: DetectionRunRequest, db: Session = Depends(get_db)) -> dict:
+def run_detection(
+    payload: DetectionRunRequest,
+    request: Request,
+    db: Session = Depends(get_db),
+) -> dict:
+    assert_guest_project_scope(request, payload.project_id)
     result = DetectionService.run_detection(
         db=db,
         project_id=payload.project_id,
@@ -76,7 +87,11 @@ def run_detection(payload: DetectionRunRequest, db: Session = Depends(get_db)) -
 
 
 @router.post("/run-async", response_model=Envelope[JobRead])
-def queue_detection(payload: DetectionRunRequest, db: Session = Depends(get_db)) -> dict:
+def queue_detection(
+    payload: DetectionRunRequest,
+    request: Request,
+    db: Session = Depends(get_db),
+) -> dict:
     """Queue a detection run for the background worker.
 
     Tiled GPU inference takes minutes; ``POST /detection/run`` performs it
@@ -84,6 +99,7 @@ def queue_detection(payload: DetectionRunRequest, db: Session = Depends(get_db))
     ``GET /jobs/{id}`` for the queued run instead.
     """
 
+    assert_guest_project_scope(request, payload.project_id)
     job = DetectionService.enqueue_detection(
         db=db,
         project_id=payload.project_id,
@@ -100,12 +116,14 @@ def queue_detection(payload: DetectionRunRequest, db: Session = Depends(get_db))
 
 @router.get("/runs", response_model=Envelope[DetectionRunListResponse])
 def list_detection_runs(
+    request: Request,
     project_id: UUID | None = None,
     dataset_id: UUID | None = None,
     limit: int = Query(default=DetectionService.DEFAULT_RUN_LIST_LIMIT, ge=0, le=5_000),
     offset: int = Query(default=0, ge=0),
     db: Session = Depends(get_db),
 ) -> dict:
+    project_id = guest_scoped_project_filter(request, project_id)
     return envelope(
         DetectionService.list_runs(
             db, project_id=project_id, dataset_id=dataset_id, limit=limit, offset=offset
@@ -114,8 +132,14 @@ def list_detection_runs(
 
 
 @router.get("/runs/{analysis_run_id}", response_model=Envelope[DetectionRunRead])
-def get_detection_run(analysis_run_id: UUID, db: Session = Depends(get_db)) -> dict:
-    return envelope(DetectionService.get_run(db, analysis_run_id).model_dump())
+def get_detection_run(
+    analysis_run_id: UUID,
+    request: Request,
+    db: Session = Depends(get_db),
+) -> dict:
+    run = DetectionService.get_run(db, analysis_run_id)
+    assert_guest_project_scope(request, run.project_id)
+    return envelope(run.model_dump())
 
 
 @router.get(
@@ -124,6 +148,7 @@ def get_detection_run(analysis_run_id: UUID, db: Session = Depends(get_db)) -> d
 )
 def list_detection_run_detections(
     analysis_run_id: UUID,
+    request: Request,
     dataset_id: UUID | None = None,
     class_name: str | None = None,
     min_confidence: float | None = None,
@@ -136,6 +161,9 @@ def list_detection_run_detections(
     offset: int = Query(default=0, ge=0),
     db: Session = Depends(get_db),
 ) -> dict:
+    if guest_project_scope(request) is not None:
+        run = DetectionService.get_run(db, analysis_run_id)
+        assert_guest_project_scope(request, run.project_id)
     return envelope(
         DetectionService.list_detections(
             db,
@@ -155,6 +183,7 @@ def list_detection_run_detections(
 )
 def list_dataset_detections(
     dataset_id: UUID,
+    request: Request,
     analysis_run_id: UUID | None = None,
     class_name: str | None = None,
     min_confidence: float | None = None,
@@ -167,6 +196,9 @@ def list_dataset_detections(
     offset: int = Query(default=0, ge=0),
     db: Session = Depends(get_db),
 ) -> dict:
+    if guest_project_scope(request) is not None:
+        dataset = DatasetService.get_dataset(db, dataset_id)
+        assert_guest_project_scope(request, dataset.project_id)
     return envelope(
         DetectionService.list_detections(
             db,
@@ -181,8 +213,14 @@ def list_dataset_detections(
 
 
 @router.get("/detections/{detection_id}", response_model=Envelope[DetectionRead])
-def get_detection(detection_id: UUID, db: Session = Depends(get_db)) -> dict:
-    return envelope(DetectionService.get_detection(db, detection_id).model_dump())
+def get_detection(
+    detection_id: UUID,
+    request: Request,
+    db: Session = Depends(get_db),
+) -> dict:
+    detection = DetectionService.get_detection(db, detection_id)
+    assert_guest_project_scope(request, detection.project_id)
+    return envelope(detection.model_dump())
 
 
 @router.get(
@@ -191,6 +229,7 @@ def get_detection(detection_id: UUID, db: Session = Depends(get_db)) -> dict:
 )
 def get_detection_run_geojson(
     analysis_run_id: UUID,
+    request: Request,
     class_name: str | None = None,
     min_confidence: float | None = None,
     limit: int = Query(
@@ -201,6 +240,9 @@ def get_detection_run_geojson(
     ),
     db: Session = Depends(get_db),
 ) -> dict:
+    if guest_project_scope(request) is not None:
+        run = DetectionService.get_run(db, analysis_run_id)
+        assert_guest_project_scope(request, run.project_id)
     return envelope(
         DetectionService.detections_to_geojson(
             db,
@@ -218,6 +260,7 @@ def get_detection_run_geojson(
 )
 def get_dataset_detection_geojson(
     dataset_id: UUID,
+    request: Request,
     analysis_run_id: UUID | None = None,
     class_name: str | None = None,
     min_confidence: float | None = None,
@@ -229,6 +272,9 @@ def get_dataset_detection_geojson(
     ),
     db: Session = Depends(get_db),
 ) -> dict:
+    if guest_project_scope(request) is not None:
+        dataset = DatasetService.get_dataset(db, dataset_id)
+        assert_guest_project_scope(request, dataset.project_id)
     return envelope(
         DetectionService.detections_to_geojson(
             db,
@@ -269,8 +315,12 @@ def compare_detection_runs(payload: DetectionComparisonRequest, db: Session = De
 def compare_detection_run_with_reference(
     analysis_run_id: UUID,
     payload: DetectionQaRequest,
+    request: Request,
     db: Session = Depends(get_db),
 ) -> dict:
+    if guest_project_scope(request) is not None:
+        run = DetectionService.get_run(db, analysis_run_id)
+        assert_guest_project_scope(request, run.project_id)
     return envelope(
         DetectionService.compare_detections_with_reference(
             db=db,

backend/app/api/routes/exports.py

@@ -2,10 +2,11 @@ from __future__ import annotations
 
 from uuid import UUID
 
-from fastapi import APIRouter, Depends, Query
+from fastapi import APIRouter, Depends, Query, Request
 from fastapi.responses import FileResponse
 from sqlalchemy.orm import Session
 
+from app.api.guest_scope import assert_guest_project_scope, guest_project_scope
 from app.core.errors import AppError
 from app.db.session import get_db
 from app.schemas import Envelope
@@ -20,13 +21,30 @@ from app.schemas.export import (
     ReportExportRequest,
 )
 from app.services.export_service import ExportService
+from app.services.dataset_service import DatasetService
+from app.services.detection_service import DetectionService
+from app.services.segmentation_service import SegmentationService
 from app.utils.response import envelope
 
 router = APIRouter(prefix="/exports", tags=["exports"])
 
 
 @router.post("/geojson", response_model=Envelope[ExportCreateResponse])
-def export_geojson(payload: GeoJsonExportRequest, db: Session = Depends(get_db)):
+def export_geojson(
+    payload: GeoJsonExportRequest,
+    request: Request,
+    db: Session = Depends(get_db),
+):
+    if guest_project_scope(request) is not None:
+        if payload.export_kind in {"dataset", "vector_selection"} and payload.dataset_id is not None:
+            dataset = DatasetService.get_dataset(db, payload.dataset_id)
+            assert_guest_project_scope(request, dataset.project_id)
+        elif payload.export_kind == "detection_run" and payload.analysis_run_id is not None:
+            run = DetectionService.get_run(db, payload.analysis_run_id)
+            assert_guest_project_scope(request, run.project_id)
+        elif payload.export_kind == "segmentation_run" and payload.analysis_run_id is not None:
+            run = SegmentationService.get_run(db, payload.analysis_run_id)
+            assert_guest_project_scope(request, run.project_id)
     if payload.export_kind == "vector_selection" and payload.dataset_id is not None and payload.bbox is not None:
         return envelope(
             ExportService.export_vector_selection_geojson(
@@ -61,17 +79,32 @@ def export_geojson(payload: GeoJsonExportRequest, db: Session = Depends(get_db))
 
 
 @router.post("/metadata", response_model=Envelope[ExportCreateResponse])
-def export_project_metadata(payload: MetadataExportRequest, db: Session = Depends(get_db)):
+def export_project_metadata(
+    payload: MetadataExportRequest,
+    request: Request,
+    db: Session = Depends(get_db),
+):
+    assert_guest_project_scope(request, payload.project_id)
     return envelope(ExportService.export_project_metadata(db, payload.project_id, payload.name).model_dump(mode="json"))
 
 
 @router.post("/report", response_model=Envelope[ExportCreateResponse])
-def export_project_report(payload: ReportExportRequest, db: Session = Depends(get_db)):
+def export_project_report(
+    payload: ReportExportRequest,
+    request: Request,
+    db: Session = Depends(get_db),
+):
+    assert_guest_project_scope(request, payload.project_id)
     return envelope(ExportService.export_project_report(db, payload.project_id, payload.name).model_dump(mode="json"))
 
 
 @router.post("/map-result", response_model=Envelope[ExportCreateResponse])
-def export_map_result(payload: MapResultExportRequest, db: Session = Depends(get_db)):
+def export_map_result(
+    payload: MapResultExportRequest,
+    request: Request,
+    db: Session = Depends(get_db),
+):
+    assert_guest_project_scope(request, payload.project_id)
     return envelope(ExportService.export_map_result(db, payload).model_dump(mode="json"))
 
 
@@ -81,25 +114,35 @@ def export_map_result(payload: MapResultExportRequest, db: Session = Depends(get
 )
 def list_project_exports(
     project_id: UUID,
+    request: Request,
     limit: int = Query(default=50, ge=1, le=100),
     offset: int = Query(default=0, ge=0),
     db: Session = Depends(get_db),
 ):
+    assert_guest_project_scope(request, project_id)
     return envelope(ExportService.list_project_exports(db, project_id, limit=limit, offset=offset).model_dump(mode="json"))
 
 
 @router.get("/{export_id}", response_model=Envelope[ExportRead])
-def get_export(export_id: UUID, db: Session = Depends(get_db)):
-    return envelope(ExportService.get_export(db, export_id).model_dump(mode="json"))
+def get_export(export_id: UUID, request: Request, db: Session = Depends(get_db)):
+    export = ExportService.get_export(db, export_id)
+    assert_guest_project_scope(request, export.project_id)
+    return envelope(export.model_dump(mode="json"))
 
 
 @router.get("/{export_id}/download")
-def download_export(export_id: UUID, db: Session = Depends(get_db)):
+def download_export(export_id: UUID, request: Request, db: Session = Depends(get_db)):
+    if guest_project_scope(request) is not None:
+        export = ExportService.get_export(db, export_id)
+        assert_guest_project_scope(request, export.project_id)
     path = ExportService.get_export_download_path(db, export_id)
     media_type = "text/html" if path.suffix.lower() in {".html", ".htm"} else "application/json"
     return FileResponse(path, filename=path.name, media_type=media_type)
 
 
 @router.get("/{export_id}/content", response_model=Envelope[ExportContentResponse])
-def get_export_content(export_id: UUID, db: Session = Depends(get_db)):
+def get_export_content(export_id: UUID, request: Request, db: Session = Depends(get_db)):
+    if guest_project_scope(request) is not None:
+        export = ExportService.get_export(db, export_id)
+        assert_guest_project_scope(request, export.project_id)
     return envelope(ExportService.get_export_content(db, export_id).model_dump(mode="json"))

backend/app/api/routes/segmentation.py

@@ -2,9 +2,14 @@ from __future__ import annotations
 
 from uuid import UUID
 
-from fastapi import APIRouter, Depends, Query
+from fastapi import APIRouter, Depends, Query, Request
 from sqlalchemy.orm import Session
 
+from app.api.guest_scope import (
+    assert_guest_project_scope,
+    guest_project_scope,
+    guest_scoped_project_filter,
+)
 from app.db.session import get_db
 from app.schemas import (
     AnalysisQaResponse,
@@ -21,6 +26,7 @@ from app.schemas import (
     SegmentationRunResponse,
 )
 from app.services.model_registry_service import ModelRegistryService
+from app.services.dataset_service import DatasetService
 from app.services.detection_service import DetectionService
 from app.services.segmentation_service import SegmentationService
 from app.utils.response import envelope
@@ -34,7 +40,12 @@ def list_segmentation_models() -> dict:
 
 
 @router.post("/run", response_model=Envelope[SegmentationRunResponse])
-def run_segmentation(payload: SegmentationRunRequest, db: Session = Depends(get_db)) -> dict:
+def run_segmentation(
+    payload: SegmentationRunRequest,
+    request: Request,
+    db: Session = Depends(get_db),
+) -> dict:
+    assert_guest_project_scope(request, payload.project_id)
     result = SegmentationService.run_segmentation(
         db=db,
         project_id=payload.project_id,
@@ -49,13 +60,18 @@ def run_segmentation(payload: SegmentationRunRequest, db: Session = Depends(get_
 
 
 @router.post("/run-async", response_model=Envelope[JobRead])
-def queue_segmentation(payload: SegmentationRunRequest, db: Session = Depends(get_db)) -> dict:
+def queue_segmentation(
+    payload: SegmentationRunRequest,
+    request: Request,
+    db: Session = Depends(get_db),
+) -> dict:
     """Queue a segmentation run for the background worker.
 
     Configured segmentation walks the same tile manifest as detection and is
     just as unsuited to running inside the request. Poll ``GET /jobs/{id}``.
     """
 
+    assert_guest_project_scope(request, payload.project_id)
     job = SegmentationService.enqueue_segmentation(
         db=db,
         project_id=payload.project_id,
@@ -71,12 +87,14 @@ def queue_segmentation(payload: SegmentationRunRequest, db: Session = Depends(ge
 
 @router.get("/runs", response_model=Envelope[SegmentationRunListResponse])
 def list_segmentation_runs(
+    request: Request,
     project_id: UUID | None = None,
     dataset_id: UUID | None = None,
     limit: int = Query(default=DetectionService.DEFAULT_RUN_LIST_LIMIT, ge=0, le=5_000),
     offset: int = Query(default=0, ge=0),
     db: Session = Depends(get_db),
 ) -> dict:
+    project_id = guest_scoped_project_filter(request, project_id)
     return envelope(
         SegmentationService.list_runs(
             db, project_id=project_id, dataset_id=dataset_id, limit=limit, offset=offset
@@ -85,8 +103,14 @@ def list_segmentation_runs(
 
 
 @router.get("/runs/{analysis_run_id}", response_model=Envelope[SegmentationRunRead])
-def get_segmentation_run(analysis_run_id: UUID, db: Session = Depends(get_db)) -> dict:
-    return envelope(SegmentationService.get_run(db, analysis_run_id).model_dump())
+def get_segmentation_run(
+    analysis_run_id: UUID,
+    request: Request,
+    db: Session = Depends(get_db),
+) -> dict:
+    run = SegmentationService.get_run(db, analysis_run_id)
+    assert_guest_project_scope(request, run.project_id)
+    return envelope(run.model_dump())
 
 
 @router.get(
@@ -95,6 +119,7 @@ def get_segmentation_run(analysis_run_id: UUID, db: Session = Depends(get_db)) -
 )
 def list_segmentation_run_outputs(
     analysis_run_id: UUID,
+    request: Request,
     dataset_id: UUID | None = None,
     class_name: str | None = None,
     min_confidence: float | None = None,
@@ -107,6 +132,9 @@ def list_segmentation_run_outputs(
     offset: int = Query(default=0, ge=0),
     db: Session = Depends(get_db),
 ) -> dict:
+    if guest_project_scope(request) is not None:
+        run = SegmentationService.get_run(db, analysis_run_id)
+        assert_guest_project_scope(request, run.project_id)
     return envelope(
         SegmentationService.list_segmentations(
             db,
@@ -126,6 +154,7 @@ def list_segmentation_run_outputs(
 )
 def list_dataset_segmentations(
     dataset_id: UUID,
+    request: Request,
     analysis_run_id: UUID | None = None,
     class_name: str | None = None,
     min_confidence: float | None = None,
@@ -138,6 +167,9 @@ def list_dataset_segmentations(
     offset: int = Query(default=0, ge=0),
     db: Session = Depends(get_db),
 ) -> dict:
+    if guest_project_scope(request) is not None:
+        dataset = DatasetService.get_dataset(db, dataset_id)
+        assert_guest_project_scope(request, dataset.project_id)
     return envelope(
         SegmentationService.list_segmentations(
             db,
@@ -152,8 +184,14 @@ def list_dataset_segmentations(
 
 
 @router.get("/segmentations/{segmentation_id}", response_model=Envelope[SegmentationRead])
-def get_segmentation(segmentation_id: UUID, db: Session = Depends(get_db)) -> dict:
-    return envelope(SegmentationService.get_segmentation(db, segmentation_id).model_dump())
+def get_segmentation(
+    segmentation_id: UUID,
+    request: Request,
+    db: Session = Depends(get_db),
+) -> dict:
+    segmentation = SegmentationService.get_segmentation(db, segmentation_id)
+    assert_guest_project_scope(request, segmentation.project_id)
+    return envelope(segmentation.model_dump())
 
 
 @router.get(
@@ -162,6 +200,7 @@ def get_segmentation(segmentation_id: UUID, db: Session = Depends(get_db)) -> di
 )
 def get_segmentation_run_geojson(
     analysis_run_id: UUID,
+    request: Request,
     class_name: str | None = None,
     min_confidence: float | None = None,
     limit: int = Query(
@@ -172,6 +211,9 @@ def get_segmentation_run_geojson(
     ),
     db: Session = Depends(get_db),
 ) -> dict:
+    if guest_project_scope(request) is not None:
+        run = SegmentationService.get_run(db, analysis_run_id)
+        assert_guest_project_scope(request, run.project_id)
     return envelope(
         SegmentationService.segmentations_to_geojson(
             db,
@@ -189,6 +231,7 @@ def get_segmentation_run_geojson(
 )
 def get_dataset_segmentation_geojson(
     dataset_id: UUID,
+    request: Request,
     analysis_run_id: UUID | None = None,
     class_name: str | None = None,
     min_confidence: float | None = None,
@@ -200,6 +243,9 @@ def get_dataset_segmentation_geojson(
     ),
     db: Session = Depends(get_db),
 ) -> dict:
+    if guest_project_scope(request) is not None:
+        dataset = DatasetService.get_dataset(db, dataset_id)
+        assert_guest_project_scope(request, dataset.project_id)
     return envelope(
         SegmentationService.segmentations_to_geojson(
             db,
@@ -219,8 +265,12 @@ def get_dataset_segmentation_geojson(
 def compare_segmentation_run_with_reference(
     analysis_run_id: UUID,
     payload: SegmentationQaRequest,
+    request: Request,
     db: Session = Depends(get_db),
 ) -> dict:
+    if guest_project_scope(request) is not None:
+        run = SegmentationService.get_run(db, analysis_run_id)
+        assert_guest_project_scope(request, run.project_id)
     return envelope(
         SegmentationService.compare_segmentations_with_reference(
             db=db,

backend/app/main.py

@@ -264,7 +264,9 @@ def create_app() -> FastAPI:
                         }
                         guest_scoped_analysis_post_paths = {
                             f"{settings.api_prefix}/detection/run",
+                            f"{settings.api_prefix}/detection/run-async",
                             f"{settings.api_prefix}/segmentation/run",
+                            f"{settings.api_prefix}/segmentation/run-async",
                             f"{settings.api_prefix}/qa/detections-vs-reference",
                             f"{settings.api_prefix}/exports/geojson",
                             f"{settings.api_prefix}/exports/metadata",

backend/app/schemas/segmentation.py

@@ -102,4 +102,9 @@ class SegmentationRead(BaseModel):
 
 class SegmentationListResponse(BaseModel):
     items: list[SegmentationRead]
+    # ``total`` describes the complete filtered population; ``items`` is one
+    # stable confidence-ranked page of it.
     total: int
+    limit: int | None = None
+    offset: int = 0
+    truncated: bool = False

backend/app/services/outbound_request_guard.py

@@ -18,7 +18,7 @@ import socket
 from collections.abc import Callable
 from typing import Any
 from urllib.parse import urlparse
-from urllib.request import HTTPRedirectHandler, build_opener, urlopen
+from urllib.request import HTTPRedirectHandler, build_opener
 
 from app.core.errors import AppError
 
@@ -38,12 +38,30 @@ class _RejectRedirects(HTTPRedirectHandler):
         return None
 
 
+class _ValidatedRedirects(HTTPRedirectHandler):
+    """Validate a redirect target before urllib opens the next connection."""
+
+    def __init__(self, expected_url: str) -> None:
+        super().__init__()
+        self.expected_url = expected_url
+
+    def redirect_request(self, req, fp, code, msg, headers, newurl):  # noqa: ANN001, D102
+        assert_same_origin_redirect(self.expected_url, newurl)
+        return super().redirect_request(req, fp, code, msg, headers, newurl)
+
+
 def no_redirect_opener():
     """An opener that will not follow a redirect anywhere."""
 
     return build_opener(_RejectRedirects())
 
 
+def validated_redirect_opener(expected_url: str):
+    """An opener that validates each redirect before following it."""
+
+    return build_opener(_ValidatedRedirects(expected_url))
+
+
 def _reject(code: str, message: str, **details: Any) -> AppError:
     return AppError(code=code, message=message, details=details or None, status_code=502)
 
@@ -88,6 +106,20 @@ def assert_public_http_url(url: str) -> None:
     host = parsed.hostname
     if not host:
         raise _reject("OUTBOUND_URL_NOT_ALLOWED", "Outbound request has no host.", url=url)
+    if parsed.username is not None or parsed.password is not None:
+        raise _reject(
+            "OUTBOUND_URL_NOT_ALLOWED",
+            "Bounded acquisition refuses credentials embedded in an outbound URL.",
+            host=host,
+        )
+    try:
+        parsed.port
+    except ValueError as error:
+        raise _reject(
+            "OUTBOUND_URL_NOT_ALLOWED",
+            "Outbound request contains an invalid port.",
+            host=host,
+        ) from error
 
     literal = host.strip("[]")
     candidates = [literal] if _looks_like_ip(literal) else _resolved_addresses(host)
@@ -133,15 +165,28 @@ def assert_same_origin_redirect(original_url: str, final_url: str) -> None:
             "The official endpoint redirected from HTTPS to an unprotected scheme.",
             redirect_scheme=final.scheme,
         )
+    # This catches embedded credentials, invalid ports and non-public
+    # resolutions before the redirect handler can construct the next request.
     assert_public_http_url(final_url)
+    original_port = original.port or (443 if original.scheme == "https" else 80)
+    final_port = final.port or (443 if final.scheme == "https" else 80)
+    same_scheme_port = final.scheme == original.scheme and final_port == original_port
+    safe_https_upgrade = original.scheme == "http" and final.scheme == "https" and final_port == 443
+    if not (same_scheme_port or safe_https_upgrade):
+        raise _reject(
+            "OUTBOUND_REDIRECT_NOT_ALLOWED",
+            "The official endpoint redirected to a different network origin.",
+            expected_port=original_port,
+            redirect_port=final_port,
+        )
 
 
 def guarded_opener(expected_url: str, *, allow_redirect: bool = True) -> Callable[..., Any]:
-    """An ``urlopen`` replacement that verifies where the response came from.
+    """An ``urlopen`` replacement that keeps redirects on the expected origin.
 
-    ``urlopen`` has already followed the redirect chain by the time it returns,
-    so the check is on ``response.url``: the body is still unread, and raising
-    here means nothing off-origin is ever parsed or persisted.
+    Redirect targets are validated by the handler *before* urllib opens the
+    next connection. The final response URL is checked again as a defensive
+    invariant for injected/custom transports.
 
     ``allow_redirect=False`` refuses any redirect at all, which is what the
     paged OGC feature readers want: a page URL they built themselves should be
@@ -151,7 +196,11 @@ def guarded_opener(expected_url: str, *, allow_redirect: bool = True) -> Callabl
 
     assert_public_http_url(expected_url)
 
-    default_transport = urlopen if allow_redirect else no_redirect_opener().open
+    default_transport = (
+        validated_redirect_opener(expected_url).open
+        if allow_redirect
+        else no_redirect_opener().open
+    )
 
     def _open(request: Any, *args: Any, _transport: Callable[..., Any] | None = None, **kwargs: Any) -> Any:
         response = (_transport or default_transport)(request, *args, **kwargs)

backend/app/services/segmentation_adapter.py

@@ -61,6 +61,41 @@ class _UltralyticsSegmentationAdapterBase:
                 message="Segmentation dependencies are not installed. Install backend optional extras with geointel-backend[ai].",
                 status_code=503,
             )
+        self.validate_runtime()
+
+    def validate_runtime(self) -> None:
+        """Fail closed when the deployment contract requires NVIDIA CUDA.
+
+        Detection and segmentation share ``YOLO_DEVICE`` and
+        ``YOLO_REQUIRE_CUDA``. Without this check segmentation could advertise
+        a GPU job while Ultralytics silently used CPU or failed only after the
+        model had already been loaded.
+        """
+
+        if not self.settings.yolo_require_cuda:
+            return
+        try:
+            import torch
+        except Exception as exc:
+            raise AppError(
+                code="SEGMENTATION_ACCELERATOR_UNAVAILABLE",
+                message="NVIDIA CUDA is required for configured segmentation, but PyTorch is not importable.",
+                status_code=503,
+            ) from exc
+        if not torch.cuda.is_available():
+            raise AppError(
+                code="SEGMENTATION_ACCELERATOR_UNAVAILABLE",
+                message="NVIDIA CUDA is required for configured segmentation, but no CUDA device is available.",
+                details={"configured_device": self.settings.yolo_device},
+                status_code=503,
+            )
+        if not str(self.settings.yolo_device).lower().startswith(("cuda", "0", "1", "2", "3")):
+            raise AppError(
+                code="SEGMENTATION_ACCELERATOR_MISCONFIGURED",
+                message="NVIDIA CUDA is required, but YOLO_DEVICE does not select a CUDA device.",
+                details={"configured_device": self.settings.yolo_device},
+                status_code=503,
+            )
 
     def _predict(self, model, tile_path: Path, confidence_threshold: float) -> list[Any]:
         if not tile_path.exists() or not tile_path.is_file():

backend/app/services/segmentation_service.py

@@ -272,6 +272,8 @@ class SegmentationService:
         dataset_id: uuid.UUID | None = None,
         class_name: str | None = None,
         min_confidence: float | None = None,
+        limit: int | None = None,
+        offset: int = 0,
     ) -> SegmentationListResponse:
         if analysis_run_id is not None:
             run = db.get(AnalysisRun, analysis_run_id)
@@ -284,8 +286,19 @@ class SegmentationService:
             class_name=class_name,
             min_confidence=min_confidence,
         )
-        items = [SegmentationRead.model_validate(row) for row in rows]
-        return SegmentationListResponse(items=items, total=len(items))
+        resolved_limit = DetectionService.DEFAULT_RESULT_LIMIT if limit is None else int(limit)
+        page, total, truncated = DetectionService.paginate(
+            rows,
+            limit=resolved_limit,
+            offset=offset,
+        )
+        return SegmentationListResponse(
+            items=[SegmentationRead.model_validate(row) for row in page],
+            total=total,
+            limit=resolved_limit,
+            offset=max(0, int(offset)),
+            truncated=truncated,
+        )
 
     @staticmethod
     def get_segmentation(db, segmentation_id: uuid.UUID) -> SegmentationRead:
@@ -847,7 +860,6 @@ class SegmentationService:
             "suppressed_segmentation_count": len(candidates) - len(filtered_candidates),
             "duplicate_iou_threshold": float(settings.segmentation_duplicate_iou_threshold),
             "containment_suppression_threshold": float(settings.segmentation_containment_nms_threshold),
-            "duplicate_iou_threshold": float(settings.segmentation_duplicate_iou_threshold),
             "tile_manifest_path": str(Path(tile_manifest_path or "").expanduser()),
             "runtime_model_provenance": runtime_model_provenance.as_dict(),
         }

backend/tests/frontend_contract.py

@@ -93,6 +93,7 @@ FEATURE_SOURCES: dict[str, tuple[str, ...]] = {
     ),
     "shell": (
         "App.tsx",
+        "WorkbenchApp.tsx",
         "components/shell/WorkbenchNavigation.tsx",
         "components/shell/SecondaryDisplay.tsx",
         "components/inspector/WorkbenchInspector.tsx",

backend/tests/test_guest_resource_scope.py

@@ -0,0 +1,347 @@
+from __future__ import annotations
+
+from pathlib import Path
+from uuid import UUID
+
+import pytest
+from fastapi.testclient import TestClient
+
+from app.core.config import get_settings
+from app.db.session import get_db
+from app.main import create_app
+from app.models import AnalysisRun, Dataset, Detection, Export, Job, Segmentation
+from app.schemas import (
+    DetectionRunListResponse,
+    DetectionRunResponse,
+    SegmentationRunListResponse,
+    SegmentationRunResponse,
+)
+from app.services.auth_service import AuthService
+from app.services.detection_service import DetectionService
+from app.services.segmentation_service import SegmentationService
+
+
+GUEST_PROJECT_ID = UUID("00000000-0000-0000-0000-000000000123")
+OTHER_PROJECT_ID = UUID("00000000-0000-0000-0000-000000000999")
+DATASET_ID = UUID("00000000-0000-0000-0000-000000000201")
+DETECTION_RUN_ID = UUID("00000000-0000-0000-0000-000000000202")
+SEGMENTATION_RUN_ID = UUID("00000000-0000-0000-0000-000000000203")
+DETECTION_ID = UUID("00000000-0000-0000-0000-000000000204")
+SEGMENTATION_ID = UUID("00000000-0000-0000-0000-000000000205")
+EXPORT_ID = UUID("00000000-0000-0000-0000-000000000206")
+JOB_ID = UUID("00000000-0000-0000-0000-000000000207")
+
+
+class FakeSession:
+    def __init__(self, objects: dict[tuple[type, UUID], object]) -> None:
+        self.objects = objects
+
+    def get(self, model, row_id):
+        return self.objects.get((model, row_id))
+
+
+def _guest_client(monkeypatch, db: FakeSession) -> TestClient:
+    password_hash = AuthService.hash_password(
+        "operator-password",
+        salt=b"guest-scope-test-salt",
+        iterations=100_000,
+    )
+    monkeypatch.setenv("GEOINTEL_AUTH_ENABLED", "true")
+    monkeypatch.setenv("GEOINTEL_AUTH_USERNAME", "operator")
+    monkeypatch.setenv("GEOINTEL_AUTH_PASSWORD_HASH", password_hash)
+    monkeypatch.setenv(
+        "GEOINTEL_AUTH_SESSION_SECRET",
+        "guest-scope-test-session-secret-value",
+    )
+    monkeypatch.setenv("GEOINTEL_GUEST_ACCESS_ENABLED", "true")
+    monkeypatch.setenv("GEOINTEL_GUEST_DISPLAY_NAME", "Gast")
+
+    client = TestClient(create_app())
+
+    def fake_db():
+        yield db
+
+    client.app.dependency_overrides[get_db] = fake_db
+    token = AuthService.create_session_token(
+        "Gast",
+        get_settings(),
+        role="guest",
+        project_id=GUEST_PROJECT_ID,
+    )
+    client.cookies.set("geointel_session", token)
+    return client
+
+
+def _project_objects(project_id: UUID, export_path: Path) -> dict[tuple[type, UUID], object]:
+    return {
+        (Dataset, DATASET_ID): Dataset(
+            id=DATASET_ID,
+            project_id=project_id,
+            name="scope-test.tif",
+            dataset_type="raster",
+            source="fixture",
+        ),
+        (AnalysisRun, DETECTION_RUN_ID): AnalysisRun(
+            id=DETECTION_RUN_ID,
+            project_id=project_id,
+            dataset_id=DATASET_ID,
+            analysis_type="detection",
+            status="success",
+            parameters_json={},
+        ),
+        (AnalysisRun, SEGMENTATION_RUN_ID): AnalysisRun(
+            id=SEGMENTATION_RUN_ID,
+            project_id=project_id,
+            dataset_id=DATASET_ID,
+            analysis_type="segmentation",
+            status="success",
+            parameters_json={},
+        ),
+        (Detection, DETECTION_ID): Detection(
+            id=DETECTION_ID,
+            project_id=project_id,
+            dataset_id=DATASET_ID,
+            analysis_run_id=DETECTION_RUN_ID,
+            model_name="fixture-detector",
+            class_name="building",
+            confidence=0.9,
+            geometry="SRID=4326;POINT (5 51)",
+        ),
+        (Segmentation, SEGMENTATION_ID): Segmentation(
+            id=SEGMENTATION_ID,
+            project_id=project_id,
+            dataset_id=DATASET_ID,
+            analysis_run_id=SEGMENTATION_RUN_ID,
+            model_name="fixture-segmenter",
+            class_name="building",
+            confidence=0.9,
+            geometry="SRID=4326;MULTIPOLYGON (((5 51, 5.1 51, 5.1 51.1, 5 51)))",
+        ),
+        (Export, EXPORT_ID): Export(
+            id=EXPORT_ID,
+            project_id=project_id,
+            export_type="dataset_geojson",
+            storage_path=str(export_path),
+            metadata_json={},
+        ),
+    }
+
+
+@pytest.mark.parametrize(
+    "path",
+    [
+        f"/api/v1/detection/runs/{DETECTION_RUN_ID}",
+        f"/api/v1/detection/runs/{DETECTION_RUN_ID}/detections",
+        f"/api/v1/detection/runs/{DETECTION_RUN_ID}/geojson",
+        f"/api/v1/detection/datasets/{DATASET_ID}/detections",
+        f"/api/v1/detection/datasets/{DATASET_ID}/geojson",
+        f"/api/v1/detection/detections/{DETECTION_ID}",
+        f"/api/v1/segmentation/runs/{SEGMENTATION_RUN_ID}",
+        f"/api/v1/segmentation/runs/{SEGMENTATION_RUN_ID}/segmentations",
+        f"/api/v1/segmentation/runs/{SEGMENTATION_RUN_ID}/geojson",
+        f"/api/v1/segmentation/datasets/{DATASET_ID}/segmentations",
+        f"/api/v1/segmentation/datasets/{DATASET_ID}/geojson",
+        f"/api/v1/segmentation/segmentations/{SEGMENTATION_ID}",
+        f"/api/v1/exports/{EXPORT_ID}",
+        f"/api/v1/exports/{EXPORT_ID}/content",
+        f"/api/v1/exports/{EXPORT_ID}/download",
+        f"/api/v1/exports/projects/{OTHER_PROJECT_ID}/exports",
+    ],
+)
+def test_matching_guest_query_cannot_authorize_another_projects_resource(
+    path: str,
+    tmp_path: Path,
+    monkeypatch,
+) -> None:
+    artifact = tmp_path / "other-project.geojson"
+    artifact.write_text('{"type":"FeatureCollection","features":[]}', encoding="utf-8")
+    client = _guest_client(monkeypatch, FakeSession(_project_objects(OTHER_PROJECT_ID, artifact)))
+
+    response = client.get(f"{path}?project_id={GUEST_PROJECT_ID}")
+
+    assert response.status_code == 403
+    assert response.json()["error"] == "GUEST_PROJECT_SCOPE_REQUIRED"
+
+
+@pytest.mark.parametrize(
+    ("path", "payload"),
+    [
+        (
+            "/api/v1/detection/run",
+            {"project_id": str(OTHER_PROJECT_ID), "dataset_id": str(DATASET_ID), "model_id": "fixture"},
+        ),
+        (
+            "/api/v1/detection/run-async",
+            {"project_id": str(OTHER_PROJECT_ID), "dataset_id": str(DATASET_ID), "model_id": "fixture"},
+        ),
+        (
+            "/api/v1/segmentation/run",
+            {"project_id": str(OTHER_PROJECT_ID), "dataset_id": str(DATASET_ID), "model_id": "fixture"},
+        ),
+        (
+            "/api/v1/segmentation/run-async",
+            {"project_id": str(OTHER_PROJECT_ID), "dataset_id": str(DATASET_ID), "model_id": "fixture"},
+        ),
+        (
+            "/api/v1/detection/runs/{run_id}/qa/reference".format(run_id=DETECTION_RUN_ID),
+            {"reference_dataset_id": str(DATASET_ID)},
+        ),
+        (
+            "/api/v1/segmentation/runs/{run_id}/qa/reference".format(run_id=SEGMENTATION_RUN_ID),
+            {"reference_dataset_id": str(DATASET_ID)},
+        ),
+        (
+            "/api/v1/exports/geojson",
+            {"export_kind": "dataset", "dataset_id": str(DATASET_ID)},
+        ),
+        (
+            "/api/v1/exports/geojson",
+            {"export_kind": "detection_run", "analysis_run_id": str(DETECTION_RUN_ID)},
+        ),
+        (
+            "/api/v1/exports/geojson",
+            {"export_kind": "segmentation_run", "analysis_run_id": str(SEGMENTATION_RUN_ID)},
+        ),
+        (
+            "/api/v1/exports/metadata",
+            {"project_id": str(OTHER_PROJECT_ID)},
+        ),
+        (
+            "/api/v1/exports/report",
+            {"project_id": str(OTHER_PROJECT_ID)},
+        ),
+        (
+            "/api/v1/exports/map-result",
+            {
+                "project_id": str(OTHER_PROJECT_ID),
+                "mode": "current",
+                "dataset_id": str(DATASET_ID),
+                "bbox": {"min_x": 5.0, "min_y": 51.0, "max_x": 5.1, "max_y": 51.1, "crs": "EPSG:4326"},
+            },
+        ),
+    ],
+)
+def test_matching_guest_query_cannot_override_post_body_or_target_scope(
+    path: str,
+    payload: dict,
+    tmp_path: Path,
+    monkeypatch,
+) -> None:
+    artifact = tmp_path / "other-project.geojson"
+    artifact.write_text("{}", encoding="utf-8")
+    client = _guest_client(monkeypatch, FakeSession(_project_objects(OTHER_PROJECT_ID, artifact)))
+
+    response = client.post(f"{path}?project_id={GUEST_PROJECT_ID}", json=payload)
+
+    assert response.status_code == 403
+    assert response.json()["error"] == "GUEST_PROJECT_SCOPE_REQUIRED"
+
+
+def test_guest_can_still_read_and_download_its_own_resources(
+    tmp_path: Path,
+    monkeypatch,
+) -> None:
+    artifact = tmp_path / "demo.geojson"
+    artifact.write_text('{"type":"FeatureCollection","features":[]}', encoding="utf-8")
+    client = _guest_client(monkeypatch, FakeSession(_project_objects(GUEST_PROJECT_ID, artifact)))
+    suffix = f"?project_id={GUEST_PROJECT_ID}"
+
+    detection = client.get(f"/api/v1/detection/runs/{DETECTION_RUN_ID}{suffix}")
+    segmentation = client.get(f"/api/v1/segmentation/runs/{SEGMENTATION_RUN_ID}{suffix}")
+    export = client.get(f"/api/v1/exports/{EXPORT_ID}{suffix}")
+    download = client.get(f"/api/v1/exports/{EXPORT_ID}/download{suffix}")
+
+    assert detection.status_code == 200
+    assert segmentation.status_code == 200
+    assert export.status_code == 200
+    assert download.status_code == 200
+    assert download.json()["type"] == "FeatureCollection"
+
+
+def test_guest_run_lists_and_new_runs_remain_bound_to_the_session_project(
+    tmp_path: Path,
+    monkeypatch,
+) -> None:
+    artifact = tmp_path / "demo.geojson"
+    artifact.write_text("{}", encoding="utf-8")
+    client = _guest_client(monkeypatch, FakeSession(_project_objects(GUEST_PROJECT_ID, artifact)))
+    observed: list[UUID] = []
+
+    def detection_list(_db, *, project_id, **_kwargs):
+        observed.append(project_id)
+        return DetectionRunListResponse(items=[], total=0, limit=50, offset=0, truncated=False)
+
+    def segmentation_list(_db, *, project_id, **_kwargs):
+        observed.append(project_id)
+        return SegmentationRunListResponse(items=[], total=0, limit=50, offset=0, truncated=False)
+
+    def detection_run(**kwargs):
+        observed.append(kwargs["project_id"])
+        return DetectionRunResponse(
+            analysis_run_id=DETECTION_RUN_ID,
+            job_id=JOB_ID,
+            project_id=kwargs["project_id"],
+            dataset_id=kwargs["dataset_id"],
+            model_id=kwargs["model_id"],
+            status="success",
+            detection_count=0,
+            message="Demo run completed",
+        )
+
+    def segmentation_run(**kwargs):
+        observed.append(kwargs["project_id"])
+        return SegmentationRunResponse(
+            analysis_run_id=SEGMENTATION_RUN_ID,
+            job_id=JOB_ID,
+            project_id=kwargs["project_id"],
+            dataset_id=kwargs["dataset_id"],
+            model_id=kwargs["model_id"],
+            status="success",
+            segmentation_count=0,
+            message="Demo run completed",
+        )
+
+    monkeypatch.setattr(DetectionService, "list_runs", detection_list)
+    monkeypatch.setattr(SegmentationService, "list_runs", segmentation_list)
+    monkeypatch.setattr(DetectionService, "run_detection", detection_run)
+    monkeypatch.setattr(SegmentationService, "run_segmentation", segmentation_run)
+
+    def enqueue_detection(**kwargs):
+        observed.append(kwargs["project_id"])
+        return Job(
+            id=JOB_ID,
+            job_type="detection.run",
+            status="queued",
+            project_id=kwargs["project_id"],
+            dataset_id=kwargs["dataset_id"],
+            parameters_json={},
+        )
+
+    monkeypatch.setattr(DetectionService, "enqueue_detection", enqueue_detection)
+
+    def enqueue_segmentation(**kwargs):
+        observed.append(kwargs["project_id"])
+        return Job(
+            id=JOB_ID,
+            job_type="segmentation.run",
+            status="queued",
+            project_id=kwargs["project_id"],
+            dataset_id=kwargs["dataset_id"],
+            parameters_json={},
+        )
+
+    monkeypatch.setattr(SegmentationService, "enqueue_segmentation", enqueue_segmentation)
+    query = f"?project_id={GUEST_PROJECT_ID}"
+    payload = {"project_id": str(GUEST_PROJECT_ID), "dataset_id": str(DATASET_ID), "model_id": "fixture"}
+
+    responses = [
+        client.get(f"/api/v1/detection/runs{query}"),
+        client.get(f"/api/v1/segmentation/runs{query}"),
+        client.post(f"/api/v1/detection/run{query}", json=payload),
+        client.post(f"/api/v1/detection/run-async{query}", json=payload),
+        client.post(f"/api/v1/segmentation/run{query}", json=payload),
+        client.post(f"/api/v1/segmentation/run-async{query}", json=payload),
+    ]
+
+    assert all(response.status_code == 200 for response in responses)
+    assert observed == [GUEST_PROJECT_ID] * 6

backend/tests/test_outbound_request_guard.py

@@ -18,8 +18,10 @@ import pytest
 
 from app.core.errors import AppError
 from app.services.outbound_request_guard import (
+    _ValidatedRedirects,
     assert_public_http_url,
     assert_same_origin_redirect,
+    validated_redirect_opener,
 )
 
 
@@ -89,6 +91,30 @@ class TestRedirects:
     def test_an_upgrade_to_https_stays_allowed(self) -> None:
         assert_same_origin_redirect("http://geo.example.be/wcs", "https://geo.example.be/wcs")
 
+    def test_a_redirect_to_another_port_is_refused(self) -> None:
+        with pytest.raises(AppError) as exc_info:
+            assert_same_origin_redirect(
+                "https://geo.api.vlaanderen.be/wcs",
+                "https://geo.api.vlaanderen.be:8443/wcs",
+            )
+
+        assert exc_info.value.code == "OUTBOUND_REDIRECT_NOT_ALLOWED"
+
+    def test_embedded_credentials_are_refused(self) -> None:
+        with pytest.raises(AppError) as exc_info:
+            assert_public_http_url("https://operator:secret@geo.example.be/wcs")
+
+        assert exc_info.value.code == "OUTBOUND_URL_NOT_ALLOWED"
+
+    def test_a_redirect_with_an_invalid_port_fails_closed(self) -> None:
+        with pytest.raises(AppError) as exc_info:
+            assert_same_origin_redirect(
+                "https://geo.api.vlaanderen.be/wcs",
+                "https://geo.api.vlaanderen.be:not-a-port/wcs",
+            )
+
+        assert exc_info.value.code == "OUTBOUND_URL_NOT_ALLOWED"
+
 
 def test_the_guard_opener_refuses_a_cross_host_redirect() -> None:
     """The opener is what the acquisition services actually call."""
@@ -249,6 +275,26 @@ def test_a_refused_redirect_is_never_requested() -> None:
     assert "_RejectRedirects" in handlers
 
 
+def test_the_default_guard_validates_before_following_a_redirect() -> None:
+    opener = validated_redirect_opener("https://geo.api.vlaanderen.be/wcs")
+    handlers = [type(handler).__name__ for handler in opener.handlers]
+
+    assert "_ValidatedRedirects" in handlers
+
+    handler = _ValidatedRedirects("https://geo.api.vlaanderen.be/wcs")
+    with pytest.raises(AppError) as exc_info:
+        handler.redirect_request(
+            None,
+            None,
+            302,
+            "Found",
+            {},
+            "http://169.254.169.254/latest/meta-data/",
+        )
+
+    assert exc_info.value.code == "OUTBOUND_REDIRECT_NOT_ALLOWED"
+
+
 def test_the_rejecting_handler_returns_no_new_request() -> None:
     from app.services.outbound_request_guard import _RejectRedirects
 

backend/tests/test_segmentation_adapter_runtime.py

@@ -0,0 +1,64 @@
+from __future__ import annotations
+
+from types import SimpleNamespace
+
+import pytest
+
+from app.core.config import Settings
+from app.core.errors import AppError
+from app.services.segmentation_adapter import YoloSegmentationAdapter
+
+
+def _settings(*, require_cuda: bool, device: str) -> Settings:
+    return Settings(
+        _env_file=None,
+        YOLO_REQUIRE_CUDA=require_cuda,
+        YOLO_DEVICE=device,
+    )
+
+
+def test_segmentation_runtime_allows_cpu_only_when_cuda_is_not_required() -> None:
+    adapter = YoloSegmentationAdapter(_settings(require_cuda=False, device="cpu"))
+
+    adapter.validate_runtime()
+
+
+def test_segmentation_runtime_rejects_missing_cuda(monkeypatch: pytest.MonkeyPatch) -> None:
+    monkeypatch.setitem(
+        __import__("sys").modules,
+        "torch",
+        SimpleNamespace(cuda=SimpleNamespace(is_available=lambda: False)),
+    )
+    adapter = YoloSegmentationAdapter(_settings(require_cuda=True, device="cuda:0"))
+
+    with pytest.raises(AppError) as exc_info:
+        adapter.validate_runtime()
+
+    assert exc_info.value.code == "SEGMENTATION_ACCELERATOR_UNAVAILABLE"
+
+
+def test_segmentation_runtime_rejects_cpu_device_when_cuda_is_required(
+    monkeypatch: pytest.MonkeyPatch,
+) -> None:
+    monkeypatch.setitem(
+        __import__("sys").modules,
+        "torch",
+        SimpleNamespace(cuda=SimpleNamespace(is_available=lambda: True)),
+    )
+    adapter = YoloSegmentationAdapter(_settings(require_cuda=True, device="cpu"))
+
+    with pytest.raises(AppError) as exc_info:
+        adapter.validate_runtime()
+
+    assert exc_info.value.code == "SEGMENTATION_ACCELERATOR_MISCONFIGURED"
+
+
+def test_segmentation_runtime_accepts_configured_cuda(monkeypatch: pytest.MonkeyPatch) -> None:
+    monkeypatch.setitem(
+        __import__("sys").modules,
+        "torch",
+        SimpleNamespace(cuda=SimpleNamespace(is_available=lambda: True)),
+    )
+    adapter = YoloSegmentationAdapter(_settings(require_cuda=True, device="cuda:0"))
+
+    adapter.validate_runtime()

backend/tests/test_segmentation_result_pagination.py

@@ -0,0 +1,151 @@
+"""Regression coverage for bounded, stable segmentation result listings."""
+
+from __future__ import annotations
+
+from datetime import UTC, datetime
+from types import SimpleNamespace
+from uuid import UUID
+
+import pytest
+from fastapi import FastAPI
+from fastapi.testclient import TestClient
+
+from app.api.routes import segmentation as segmentation_routes
+from app.db.session import get_db
+from app.schemas.segmentation import SegmentationListResponse
+from app.services.segmentation_service import SegmentationService
+
+
+RUN_ID = UUID("00000000-0000-0000-0000-000000000101")
+DATASET_ID = UUID("00000000-0000-0000-0000-000000000102")
+PROJECT_ID = UUID("00000000-0000-0000-0000-000000000103")
+
+
+def _segmentation(index: int) -> SimpleNamespace:
+    return SimpleNamespace(
+        id=UUID(int=index + 1),
+        project_id=PROJECT_ID,
+        dataset_id=DATASET_ID,
+        analysis_run_id=RUN_ID,
+        job_id=None,
+        model_name="segmentation-test-model",
+        model_version="1",
+        class_name="building",
+        confidence=0.99 - index / 100,
+        bbox_json=None,
+        area_m2=float(index + 1),
+        mask_path=None,
+        source_tile_path=None,
+        tile_index=index,
+        properties_json={},
+        provenance_json={},
+        created_at=datetime(2026, 8, 23, tzinfo=UTC),
+    )
+
+
+class _Session:
+    def get(self, _model, identifier):
+        if identifier == RUN_ID:
+            return SimpleNamespace(analysis_type="segmentation")
+        return None
+
+
+def test_service_returns_one_stable_page_with_complete_metadata(monkeypatch) -> None:
+    rows = [_segmentation(index) for index in range(5)]
+    monkeypatch.setattr(
+        SegmentationService,
+        "_query_segmentation_rows",
+        staticmethod(lambda _db, **_filters: rows),
+    )
+
+    result = SegmentationService.list_segmentations(
+        _Session(),
+        analysis_run_id=RUN_ID,
+        dataset_id=DATASET_ID,
+        limit=2,
+        offset=1,
+    )
+
+    assert [item.id for item in result.items] == [rows[1].id, rows[2].id]
+    assert result.total == 5
+    assert result.limit == 2
+    assert result.offset == 1
+    assert result.truncated is True
+
+
+def test_service_pages_cover_the_stably_ordered_population_once(monkeypatch) -> None:
+    rows = [_segmentation(index) for index in range(5)]
+    monkeypatch.setattr(
+        SegmentationService,
+        "_query_segmentation_rows",
+        staticmethod(lambda _db, **_filters: rows),
+    )
+
+    seen = []
+    for offset in (0, 2, 4):
+        result = SegmentationService.list_segmentations(
+            _Session(),
+            dataset_id=DATASET_ID,
+            limit=2,
+            offset=offset,
+        )
+        seen.extend(item.id for item in result.items)
+        assert result.total == len(rows)
+        assert result.offset == offset
+
+    assert seen == [row.id for row in rows]
+
+
+@pytest.mark.parametrize(
+    ("path", "expected_run_id", "expected_dataset_id"),
+    [
+        (f"/api/v1/segmentation/runs/{RUN_ID}/segmentations", RUN_ID, None),
+        (f"/api/v1/segmentation/datasets/{DATASET_ID}/segmentations", None, DATASET_ID),
+    ],
+)
+def test_both_listing_routes_forward_the_page_window_and_return_it(
+    monkeypatch,
+    path: str,
+    expected_run_id: UUID | None,
+    expected_dataset_id: UUID | None,
+) -> None:
+    calls: list[dict] = []
+
+    def _list(_db, analysis_run_id=None, **parameters):
+        calls.append({"analysis_run_id": analysis_run_id, **parameters})
+        return SegmentationListResponse(
+            items=[],
+            total=9,
+            limit=2,
+            offset=4,
+            truncated=True,
+        )
+
+    monkeypatch.setattr(SegmentationService, "list_segmentations", staticmethod(_list))
+    app = FastAPI()
+    app.include_router(segmentation_routes.router, prefix="/api/v1")
+    app.dependency_overrides[get_db] = lambda: object()
+
+    response = TestClient(app).get(
+        path,
+        params={"limit": 2, "offset": 4, "class_name": "building", "min_confidence": 0.5},
+    )
+
+    assert response.status_code == 200
+    assert response.json()["data"] == {
+        "items": [],
+        "total": 9,
+        "limit": 2,
+        "offset": 4,
+        "truncated": True,
+    }
+    assert calls == [
+        {
+            "analysis_run_id": expected_run_id,
+            "limit": 2,
+            "offset": 4,
+            "dataset_id": expected_dataset_id,
+            "class_name": "building",
+            "min_confidence": 0.5,
+        }
+    ]

backend/tests/test_sprint104_ai_lab_action_guardrails.py

@@ -15,7 +15,8 @@ def test_detection_lab_distinguishes_configured_model_from_ui_runnable_action()
     assert "detectionRunBlockedReason" in lab
     assert "Het fixturemodel is alleen bedoeld voor expliciete tests" in lab
     assert "Klaar om gebouwen te zoeken" in lab
-    assert "disabled={runningDetection || !detectionRunReady}" in lab
+    assert "disabled={runningDetection || runningDetectionCalibration || detectionJobActive || !detectionRunReady}" in lab
+    assert "detectionJob?.status === 'queued' || detectionJob?.status === 'running'" in lab
 
 
 def test_segmentation_lab_distinguishes_configured_model_from_ui_runnable_action() -> None:
@@ -26,7 +27,8 @@ def test_segmentation_lab_distinguishes_configured_model_from_ui_runnable_action
     assert "segmentationRunBlockedReason" in lab
     assert "Het fixturemodel is alleen bedoeld voor expliciete tests" in lab
     assert "Analyse" in lab
-    assert "disabled={runningSegmentation || !segmentationRunReady}" in lab
+    assert "disabled={runningSegmentation || segmentationJobActive || !segmentationRunReady}" in lab
+    assert "segmentationJob?.status === 'queued' || segmentationJob?.status === 'running'" in lab
 
 
 def test_ai_lab_guardrail_styles_remain_compact() -> None:

backend/tests/test_sprint123_raster_detection_handoff_operational.py

@@ -28,7 +28,12 @@ def test_raster_controls_show_manifest_details_and_ai_handoff_action() -> None:
 
 
 def test_detection_handoff_opens_ai_lab_preflights_manifest_and_keeps_asset_explicit() -> None:
-    app = (ROOT / "frontend" / "src" / "App.tsx").read_text(encoding="utf-8")
+    app = "\n".join(
+        (
+            (ROOT / "frontend" / "src" / "App.tsx").read_text(encoding="utf-8"),
+            (ROOT / "frontend" / "src" / "WorkbenchApp.tsx").read_text(encoding="utf-8"),
+        )
+    )
     lab = "\n".join(
         (
             (ROOT / "frontend" / "src" / "components" / "detection" / "DetectionLab.tsx").read_text(encoding="utf-8"),
@@ -40,7 +45,7 @@ def test_detection_handoff_opens_ai_lab_preflights_manifest_and_keeps_asset_expl
     assert "setSelectedDetectionDatasetId(selectedDataset.id)" in app
     assert "setSelectedDetectionModelId('yolo-configured')" in app
     assert "setDetectionConfidenceThreshold(0.25)" in app
-    assert "loadYoloPreflight(manifestPath).catch(() => null)" in app
+    assert "loadYoloPreflight(manifestPath).catch(() => meldLaadfout('modelcontrole'))" in app
     assert "setSelectedModelAssetId(" not in app[app.index("const useRasterTileManifestForDetection"):app.index("const {", app.index("const useRasterTileManifestForDetection"))]
     assert "Gekoppelde beeldtegels" in lab
     assert "Gekoppelde beeldtegels" in lab

backend/tests/test_sprint195_guided_detection_workflow.py

@@ -26,8 +26,10 @@ def test_guided_detection_reuses_canonical_raster_and_detection_apis() -> None:
     assert "effectiveModelId" in hook
     assert "effectiveModelAssetId" in hook
     assert "await loadDetectionResults(result.analysis_run_id)" in hook
-    assert "model_id: selectedDetectionModelId" in hook
-    assert "model_asset_id: selectedModelAssetId || null" in hook
+    assert "model_id: modelId" in hook
+    assert "model_asset_id: modelAssetId || null" in hook
+    assert "effectiveModelId" in hook
+    assert "effectiveModelAssetId" in hook
 
 
 def test_guided_detection_upload_uses_existing_dataset_persistence_boundary() -> None:
@@ -63,7 +65,8 @@ def test_detection_qa_remains_persisted_and_primary_not_parallel() -> None:
     assert 'aria-label="Kwaliteitscontrole gebouwdetectie"' in lab
     assert "als kwaliteitscontrole in de database bewaard" in lab
     assert "detectionApi.compareWithReference" in hook
-    assert "await loadQualityChecks(selectedProjectId)" in hook
+    assert "await loadQualityChecks(projectId)" in hook
+    assert "detectionQaRequestSequence.current" in hook
     assert "Minimale IoU voor een match" in lab
     assert "detectionQaResult.iou_threshold.toFixed(2)" in lab
 

docs/API_CONTRACTS.md

@@ -1528,7 +1528,10 @@ Response:
 
 ## Detection Lab
 
-Sprint 8 implements Detection Lab foundation only. YOLO/PyTorch real inference is not enabled, no model is downloaded, and fixture detections require explicit fixture mode.
+Detection Lab exposes the governed local YOLO/PyTorch runtime only when model,
+dependencies and the configured NVIDIA accelerator pass preflight. GeoIntel
+never downloads a model implicitly; fixture detections still require explicit
+fixture mode and are not production inference.
 
 ### Guided browser orchestration
 
@@ -1537,11 +1540,17 @@ The current frontend offers one guided building-analysis action, but does not ad
 1. optional explicit `POST /api/v1/projects/{project_id}/datasets/upload` for a georeferenced GeoTIFF;
 2. `POST /api/v1/projects/{project_id}/datasets/{dataset_id}/raster/tile` with 512 px tiles and 64 px overlap;
 3. `GET /api/v1/detection/yolo/preflight` with the returned manifest and selected local model asset;
-4. `POST /api/v1/detection/run` only after successful preflight;
-5. persisted run, Detection list and Detection GeoJSON reads;
-6. optional persisted reference QA through the existing detection QA endpoint.
+4. `POST /api/v1/detection/run-async` only after successful preflight;
+5. project-bound polling through
+   `GET /api/v1/projects/{project_id}/jobs/{job_id}` until a terminal state;
+6. persisted run, Detection list and Detection GeoJSON reads;
+7. optional persisted reference QA through the existing detection QA endpoint.
 
-The strict `POST /api/v1/detection/run` contract still requires `tile_manifest_path` for configured YOLO. The frontend does not create fake tiles, bypass tile limits, fetch external imagery or download model weights.
+The strict async request contract still requires `tile_manifest_path` for
+configured YOLO. The production frontend does not fall back to the synchronous
+inference route, create fake tiles, bypass tile limits, fetch external imagery
+or download model weights. A zero-count success remains a completed inference,
+not proof that the selected area contains no objects.
 
 ### GET `/api/v1/detection/models`
 
@@ -1758,8 +1767,12 @@ rejected immediately rather than by a job that fails minutes later.
 Queued jobs are executed by the background analysis worker
 (`GEOINTEL_ANALYSIS_WORKER_ENABLED`, poll interval
 `GEOINTEL_ANALYSIS_WORKER_POLL_SECONDS`), which claims a job before dispatching
-it so the same run is never started twice. Poll `GET /api/v1/jobs/{id}` for
-progress. `POST /api/v1/segmentation/run-async` behaves identically.
+it so the same run is never started twice. Poll the project-bound
+`GET /api/v1/projects/{project_id}/jobs/{job_id}` endpoint for progress.
+`POST /api/v1/segmentation/run-async` behaves identically. Guest sessions may
+queue and read analysis only for the project id embedded in their signed
+session; query parameters never authorize a run, result or export belonging to
+another project.
 
 Unavailable model response:
 
@@ -2032,7 +2045,12 @@ Same pattern as object detection, but output includes masks and polygonized geom
 
 ## Segmentation Lab
 
-Sprint 9 implements Segmentation Lab foundation only. Real SAM and YOLO-seg inference are not enabled, no model is downloaded, and fixture segmentations require explicit fixture mode.
+Segmentation Lab exposes a configured local YOLO-seg or SAM runtime when its
+model file, immutable runtime provenance and dependencies validate. No model is
+downloaded. On the NVIDIA server, `YOLO_REQUIRE_CUDA=true` makes both configured
+segmentation adapters fail closed when CUDA is absent or `YOLO_DEVICE` selects
+CPU. Fixture segmentations remain explicit test-only data and the production
+browser never queues that model.
 
 ### GET `/api/v1/segmentation/models`
 
@@ -2043,6 +2061,9 @@ Returns segmentation model capability descriptors:
 - `yolo-seg-configured`: `not_configured`
 - `sam-configured`: `not_configured`
 
+The two configured entries become `configured` only when their corresponding
+enable flag, local model file and provenance sidecar validate.
+
 ### POST `/api/v1/segmentation/run`
 
 Creates a segmentation job and segmentation analysis run. If the requested model is unavailable, the job and analysis run are marked `failed` with `SEGMENTATION_MODEL_UNAVAILABLE`.
@@ -2063,6 +2084,16 @@ Request:
 
 Fixture segmenter mode is test/demo-only. It persists only explicit `parameters_json.fixture_segmentations` entries when `parameters_json.fixture_mode=true`; it is never invoked automatically and does not represent production inference.
 
+The production frontend uses `POST /api/v1/segmentation/run-async`, then polls
+`GET /api/v1/projects/{project_id}/jobs/{job_id}` and reconciles the terminal
+job with its persisted `AnalysisRun` and polygon records. It does not fall back
+to the synchronous route. A configured model requires an existing
+`tile_manifest_path`; missing CUDA fails with
+`SEGMENTATION_ACCELERATOR_UNAVAILABLE` or
+`SEGMENTATION_ACCELERATOR_MISCONFIGURED` when CUDA is required. A valid
+zero-polygon run is shown as an empty model result, never as proof that the AOI
+contains no relevant objects.
+
 Validation errors:
 
 - `INVALID_DATASET_TYPE` when the dataset is not raster.
@@ -2086,6 +2117,11 @@ Returns persisted segmentation records for a segmentation analysis run. Optional
 - `dataset_id`
 - `class_name`
 - `min_confidence`
+- `limit` (`0` means every matching record, otherwise capped at `50000`)
+- `offset`
+
+The response reports `total`, `limit`, `offset` and `truncated`; clients must
+not present a truncated page as the complete polygon population.
 
 ### GET `/api/v1/segmentation/datasets/{dataset_id}/segmentations`
 

docs/CODEX_EXECUTION_LOG.md

@@ -12867,3 +12867,71 @@ Open:
 - Browser emulation covers responsive layout and interaction; certification on
   physical touch hardware and with a screen reader remains a separate human QA
   activity.
+
+## 2026-08-23 - Sol Ultra product-, runtime- en betrouwbaarheidsronde
+
+### Delivered
+
+- Split the public landing foundation from the lazy workbench and MapLibre
+  styles. The initial production CSS payload dropped from roughly 219 kB to
+  38.38 kB while the authenticated workbench keeps its complete styling.
+- Extended the reproducible browser audit to cover the landing and workbench at
+  390 x 844, 1366 x 768 and 2560 x 1080, including mobile navigation,
+  keyboard tabs, loading state, advanced map flow and every guest workspace.
+- Corrected the smartphone shell hierarchy: topbar, guest banner and page
+  heading no longer overlap, and the live Selecteer/Bronnen/Verwerk/Controleer
+  rail now sits below the map actions instead of behind the fixed navigation.
+- Kept full workspace titles for headings and accessible names while shortening
+  the two mobile navigation labels to `AI-beeld` and `Export`; the browser gate
+  now rejects any visible sidebar label whose text box is clipped.
+- Made map-analysis failures outrank empty states and added an explicit retry;
+  new selections clear stale coverage immediately.
+- Replaced synchronous browser inference with governed async detection and
+  segmentation queues, project-bound job polling and persisted-run
+  reconciliation. Detection has NVIDIA preflight; segmentation now fails
+  closed under the same server CUDA contract. Zero-result runs are communicated
+  without claiming that the AOI is object-free.
+- Bound guest detection, segmentation and export reads/writes to the signed
+  demo project at the resource level. Matching query parameters can no longer
+  authorize another project's run, dataset, result or download.
+- Closed stale-response races in temporal comparison and the local GeoAI
+  assistant, plus detection/segmentation run, result and QA flows across project
+  switches. Previously visited workspaces no longer reload together after every
+  navigation change.
+- Added keyboard-complete pipeline tabs and React-driven model-dialog state,
+  initial focus and trigger-focus restoration. Landing scrolling now respects
+  `prefers-reduced-motion`.
+- Hardened outbound acquisition redirects before the redirected request is
+  opened, including origin/port and embedded-credential rejection, and fixed
+  bounded pagination for segmentation result lists.
+- Fixed segmentation readiness and section status: configured production
+  models now require a real tile manifest before queueing, fixture mode is
+  visibly test-only, and queued/running NVIDIA work has an explicit live state.
+- Localised known model registrations and availability states in the Dutch UI;
+  raw English backend placeholder copy no longer leaks into the primary model
+  selector or readiness guidance.
+
+### Verification
+
+- Frontend TypeScript check and production build passed.
+- Complete frontend suite: 36 files / 151 tests passed.
+- Relevant backend release set: 121 tests passed, covering async analysis jobs,
+  atomic claims, guest/resource isolation, redirect policy, segmentation
+  pagination, NVIDIA runtime enforcement and current AI-lab contracts.
+- Ruff passed over every changed backend Python module and test.
+- Browser evidence passed across three landing and three authenticated
+  workbench viewports with zero horizontal overflow, console errors or failed
+  API requests in `.codex-artifacts/sol-ultra-final-l/manifest.json`; focused
+  AI-workspace and segmentation screenshots are stored beside it.
+- Production build passed. Initial landing CSS remains 38.38 kB (8.22 kB
+  gzip); the lazy workbench JS is 479.76 kB (129.25 kB gzip) and MapLibre stays
+  isolated in its own lazy chunk.
+
+### Boundaries
+
+- This pass improves runtime correctness and presentation; it does not invent a
+  new accuracy claim or promote a model checkpoint. Existing governed model
+  evidence and regional release gates remain authoritative.
+- Physical touch-device and screen-reader certification remain human QA. No
+  commit or deployment was performed because the active execution brief
+  explicitly forbids committing unless requested.

docs/TODO.md

@@ -1109,6 +1109,32 @@ This file now starts with the current implementation status. Older preparation/b
 - [x] Loading-, empty-, unavailable- en errorstates plus toetsenbord- en dialogbediening.
 - [x] Zoekbare en bredere kaartthemalijst met volledig leesbare labels.
 - [x] Compacte analysecontextbalk en rustige desktop/tablet/mobiele hiërarchie.
+
+# Sprint 237 - Sol Ultra productupgrade (2026-08-23)
+
+- [x] Splits publieke landing-CSS en MapLibre van de lazy werkbankbundel.
+- [x] Valideer landing en werkbank op 390, 1366 en 2560 px zonder overflow,
+  consolefouten of mislukte API-requests.
+- [x] Herstel mobiele topbar/banner/kop- en procesrailbotsingen.
+- [x] Voorkom afgekapte mobiele navigatielabels met korte zichtlabels en een
+  automatische clipping-gate.
+- [x] Toon analysefouten vóór lege states en bied een herhaalactie.
+- [x] Wis oude dekkingsdata zodra een nieuwe AOI wordt opgelost.
+- [x] Sluit stale-response races in tijdvergelijking en AI-vragen.
+- [x] Sluit late detectie-/segmentatiejobs, resultaten en QA na een
+  werkruimtewissel uit.
+- [x] Voer productie-detectie uitsluitend via async NVIDIA/GPU-jobs uit en
+  verzoen het resultaat met de bewaarde AnalysisRun.
+- [x] Voer productie-segmentatie uitsluitend via async serverjobs uit, eis een
+  tegelmanifest en laat de NVIDIA-runtime fail-closed valideren.
+- [x] Bind gast-detecties, segmentaties en downloads aan het gesigneerde
+  demoproject op resourceniveau.
+- [x] Valideer redirects vóór netwerktoegang en begrens segmentatieresultaten.
+- [x] Maak pipeline-tabs en modeldialoog volledig toetsenbordbedienbaar.
+- [x] Lokaliseer bekende modelnamen en beschikbaarheidsmeldingen in de primaire
+  Nederlandse AI-flow.
+- [ ] Voer vóór formele toegankelijkheidscertificatie nog fysieke touch- en
+  screenreader-QA uit; browseremulatie en automatische naamcontrole zijn groen.
 - [x] Uitschuifbare inzichten behouden; analyse blijft uitsluitend expliciet na themakeuze.
 - [x] 51 frontendtests en productiebuild groen.
 - [ ] 19 verouderde broncode-stringtests herijken; meerdere eisen daarin (automatische analyse) conflicteren bewust met de actuele productbeslissing.

frontend/README.md

@@ -160,7 +160,9 @@ font dependency.
 
 ## Current component boundaries
 
-`App.tsx` remains the shared workspace orchestrator, while focused surfaces
+`App.tsx` only decides which of the two shells to show: the landing page or the
+workbench. `WorkbenchApp.tsx` is the shared workspace orchestrator and is loaded
+lazily, so the sign-in screen does not pay for the map engine. Focused surfaces
 and pure map helpers are kept outside it:
 
 - `components/overview/OverviewWorkspace.tsx` owns status, source freshness,
@@ -836,3 +838,45 @@ The audit covers 390x844, 1366x768 and 2560x1080, every top-level workspace,
 keyboard operation of the analysis period, skip-link focus, delayed bootstrap
 truthfulness and visible coverage timing. The enforced limits are documented
 in `docs/UX_PERFORMANCE_BUDGETS.md`.
+
+## Visual audit follow-through
+
+The workbench runs dark by default; the landing page stays light. A toggle in
+the top bar switches between them and remembers the choice per browser. The
+operating system preference is deliberately ignored: browsers report `light` by
+default even when the user never chose, which would put almost everyone in the
+wrong mode.
+
+`styles/geointel-system.css` is loaded last and leads. Thirteen tokens were
+called on 87 lines without ever being defined, so those colour declarations fell
+back to inheritance; they now resolve. Shape and elevation went back onto the
+scale, and the weight scale has four steps that are each actually loaded — the
+stylesheets previously declared nine weights while two faces were available, and
+`font-synthesis-weight: none` meant everything from 650 to 850 rendered as 600.
+
+Real `!important` went from 47 to 1, verified by comparing computed styles
+between production builds. The remaining one is documented where it stands.
+Fifteen of the removed ones sat in the second-screen block: that window is
+opened with `window.open('')` and never fetched the linked stylesheet, so they
+were overriding something that never arrived. `SecondaryDisplay.tsx` now inlines
+the rules and adopts the already-loaded font faces.
+
+Contrast is measured with a gradient-aware checker across six workspaces in both
+modes; the threshold is WCAG AA.
+
+## Loading strategy
+
+The workbench is a separate chunk behind `React.lazy`. The sign-in screen loads
+344 kB over the wire instead of 1.46 MB.
+
+`apiGet` shares concurrent and closely-following identical requests for 300 ms.
+This collapses the start-up cascade, where two effects asked for the same areas
+and datasets about ninety milliseconds apart. The table is cleared on sign-in,
+sign-out and session expiry, because signing out does not reload the page.
+
+Each workspace loads its own data when it is first opened rather than everything
+up front. Start-up went from 27 requests to 16.
+
+Source images for the web assets live in `design-assets/`, not in `public/`.
+Everything in `public/` is copied verbatim into `dist/`, so 8.1 MB of unused PNG
+masters shipped with every build.

frontend/design-assets/README.md

@@ -0,0 +1,14 @@
+# Bronbestanden voor beeld
+
+Hier staan de originelen waaruit de webversies in `public/` gemaakt zijn.
+
+Ze stonden eerder in `public/portfolio/`. Alles in `public/` wordt door Vite
+ongewijzigd naar `dist/` gekopieerd, dus die 8,1 MB aan PNG's werd bij elke
+build meegedeployed terwijl geen enkele regel code ernaar verwijst — alleen de
+webp-versies worden gebruikt.
+
+Een master hoort bewaard te blijven, maar niet in de map die de webserver
+uitserveert. Wie een webversie opnieuw wil maken:
+
+    python -c "from PIL import Image; im=Image.open('design-assets/portfolio/x.png'); \
+      im.resize((1600, round(im.height*1600/im.width))).save('public/portfolio/x.webp','WEBP',quality=58,method=6)"

frontend/e2e/uxAudit.mjs

@@ -63,9 +63,34 @@ async function auditInteractiveNames(page, label) {
   return unnamed.length
 }
 
+async function prepareAuditSession(page, baseUrl) {
+  const sessionResponse = await page.request.get(`${baseUrl}/api/v1/auth/session`)
+  assert(sessionResponse.ok(), `Session preflight failed with HTTP ${sessionResponse.status()}`)
+  const sessionEnvelope = await sessionResponse.json()
+  const session = sessionEnvelope?.data
+
+  if (!session?.authentication_required || session.authenticated) return session
+  assert.equal(
+    session.guest_access_enabled,
+    true,
+    'UX audit needs an authenticated session or enabled guest access',
+  )
+
+  const guestResponse = await page.request.post(`${baseUrl}/api/v1/auth/guest`)
+  assert(guestResponse.ok(), `Guest audit session failed with HTTP ${guestResponse.status()}`)
+  const guestEnvelope = await guestResponse.json()
+  return guestEnvelope?.data
+}
+
 async function layoutEvidence(page) {
   return page.evaluate(() => {
     const root = document.documentElement
+    const rect = (selector) => {
+      const bounds = document.querySelector(selector)?.getBoundingClientRect()
+      return bounds
+        ? { top: bounds.top, bottom: bounds.bottom, left: bounds.left, right: bounds.right, width: bounds.width, height: bounds.height }
+        : null
+    }
     const main = document.querySelector('.workbench-main')?.getBoundingClientRect()
     const map = document.querySelector('.geo-map-stage')?.getBoundingClientRect()
     const theme = document.querySelector('.geo-theme-panel')?.getBoundingClientRect()
@@ -75,6 +100,11 @@ async function layoutEvidence(page) {
       document_width: root.scrollWidth,
       body_width: document.body.scrollWidth,
       horizontal_overflow_px: Math.max(0, root.scrollWidth - root.clientWidth),
+      shell_navigation: rect('.workbench-sidebar'),
+      topbar: rect('.workbench-topbar'),
+      guest_banner: rect('.guest-mode-banner'),
+      explorer_header: rect('.geo-explorer-header'),
+      live_analysis_journey: rect('.live-analysis-journey'),
       main: main ? { left: main.left, right: main.right, width: main.width } : null,
       map: map ? { left: map.left, right: map.right, width: map.width, height: map.height } : null,
       theme: theme ? { left: theme.left, right: theme.right, width: theme.width } : null,
@@ -82,6 +112,57 @@ async function layoutEvidence(page) {
   })
 }
 
+async function runLandingViewport(browser, baseUrl, outputDir, viewport) {
+  const page = await browser.newPage({ viewport })
+  const consoleErrors = []
+  const failedRequests = []
+  page.on('console', (message) => {
+    if (message.type() === 'error') consoleErrors.push(message.text())
+  })
+  page.on('pageerror', (error) => consoleErrors.push(error.message))
+  page.on('requestfailed', (request) => {
+    if (request.url().startsWith(baseUrl)) {
+      failedRequests.push(`${request.method()} ${request.url()}: ${request.failure()?.errorText}`)
+    }
+  })
+  try {
+    await page.goto(baseUrl, { waitUntil: 'networkidle', timeout: 60_000 })
+    await page.locator('.landing-page').waitFor({ state: 'visible', timeout: 15_000 })
+    await auditInteractiveNames(page, `${viewport.width}px landing`)
+    const horizontalOverflow = await page.evaluate(() => (
+      Math.max(0, document.documentElement.scrollWidth - document.documentElement.clientWidth)
+    ))
+    assert.equal(horizontalOverflow, 0, `${viewport.width}px landing overflows horizontally`)
+    assert.equal(
+      await page.getByRole('heading', { level: 1 }).count(),
+      1,
+      `${viewport.width}px landing needs one clear primary heading`,
+    )
+
+    if (viewport.width <= 760) {
+      const menu = page.locator('.landing-menu-toggle')
+      assert.equal(await menu.getAttribute('aria-label'), 'Navigatie openen')
+      await menu.click()
+      assert.equal(await menu.getAttribute('aria-expanded'), 'true')
+      await page.getByRole('navigation', { name: 'Landingspagina' }).waitFor({ state: 'visible' })
+      await page.getByRole('button', { name: 'Navigatie sluiten' }).click()
+    }
+
+    await page.screenshot({
+      path: path.join(outputDir, `landing-${viewport.width}x${viewport.height}.png`),
+      fullPage: true,
+    })
+    return {
+      viewport,
+      horizontal_overflow_px: horizontalOverflow,
+      console_errors: consoleErrors,
+      failed_requests: failedRequests,
+    }
+  } finally {
+    await page.close()
+  }
+}
+
 async function runViewport(browser, baseUrl, outputDir, viewport) {
   const page = await browser.newPage({ viewport })
   const consoleErrors = []
@@ -96,14 +177,41 @@ async function runViewport(browser, baseUrl, outputDir, viewport) {
     }
   })
   try {
+    await prepareAuditSession(page, baseUrl)
     const startedAt = Date.now()
     await page.goto(baseUrl, { waitUntil: 'networkidle', timeout: 60_000 })
     await page.getByTestId('map-workspace').waitFor({ state: 'visible', timeout: 30_000 })
     const readyMs = Date.now() - startedAt
     await auditInteractiveNames(page, `${viewport.width}px map explorer`)
     const layout = await layoutEvidence(page)
+    const clippedNavigationLabels = await page.locator('.nav-item span').evaluateAll((labels) => labels
+      .filter((label) => label.getClientRects().length > 0 && label.scrollWidth > label.clientWidth + 1)
+      .map((label) => label.textContent?.trim() || ''))
     assert.equal(layout.horizontal_overflow_px, 0, `${viewport.width}px layout overflows horizontally`)
+    assert.deepEqual(clippedNavigationLabels, [], `${viewport.width}px navigation clips visible labels`)
     assert(layout.map && layout.map.width >= Math.min(320, viewport.width - 32), `${viewport.width}px map is too narrow`)
+    if (layout.topbar && layout.guest_banner) {
+      assert(
+        layout.topbar.bottom <= layout.guest_banner.top + 1,
+        `${viewport.width}px topbar overlaps the guest access banner`,
+      )
+    }
+    if (layout.guest_banner && layout.explorer_header) {
+      assert(
+        layout.guest_banner.bottom <= layout.explorer_header.top + 1,
+        `${viewport.width}px guest access banner overlaps the explorer heading`,
+      )
+    }
+    if (layout.shell_navigation && layout.live_analysis_journey) {
+      const verticalOverlap = Math.min(layout.shell_navigation.bottom, layout.live_analysis_journey.bottom)
+        - Math.max(layout.shell_navigation.top, layout.live_analysis_journey.top)
+      const horizontalOverlap = Math.min(layout.shell_navigation.right, layout.live_analysis_journey.right)
+        - Math.max(layout.shell_navigation.left, layout.live_analysis_journey.left)
+      assert(
+        verticalOverlap <= 1 || horizontalOverlap <= 1,
+        `${viewport.width}px navigation overlaps the live analysis journey`,
+      )
+    }
 
     const currentTab = page.getByRole('tab', { name: 'Laatste toestand' })
     const evolutionTab = page.getByRole('tab', { name: 'Evolutie' })
@@ -127,6 +235,7 @@ async function runViewport(browser, baseUrl, outputDir, viewport) {
       viewport,
       ready_ms: readyMs,
       layout,
+      clipped_navigation_labels: clippedNavigationLabels,
       console_errors: consoleErrors,
       failed_requests: failedRequests,
     }
@@ -144,6 +253,7 @@ async function runLoadingAndAdvancedAudit(browser, baseUrl, outputDir) {
     await route.continue()
   })
   try {
+    const auditSession = await prepareAuditSession(page, baseUrl)
     await page.goto(baseUrl, { waitUntil: 'domcontentloaded', timeout: 60_000 })
     const loadingStatus = page.getByRole('status', { name: '' }).filter({
       hasText: 'Databronnen worden gecontroleerd',
@@ -175,10 +285,30 @@ async function runLoadingAndAdvancedAudit(browser, baseUrl, outputDir) {
     await page.screenshot({ path: path.join(outputDir, 'advanced-coverage-budget.png') })
 
     const auditedWorkspaces = []
-    for (const workspace of ['data', 'assistant', 'analysis', 'ai', 'exports', 'overview', 'system']) {
+    const workspaceKeys = ['data', 'assistant', 'analysis', 'ai', 'exports', 'overview']
+    if (auditSession?.role === 'guest') {
+      assert.equal(
+        await page.getByTestId('workspace-nav-system').count(),
+        0,
+        'Guest session exposes operator-only system settings',
+      )
+    } else {
+      workspaceKeys.push('system')
+    }
+    for (const workspace of workspaceKeys) {
       await page.getByTestId(`workspace-nav-${workspace}`).click()
       await page.waitForTimeout(100)
       await auditInteractiveNames(page, `${workspace} workspace`)
+      if (workspace === 'ai') {
+        await page.screenshot({ path: path.join(outputDir, 'ai-workspace.png'), fullPage: true })
+        const segmentationDisclosure = page.locator('.segmentation-disclosure')
+        await segmentationDisclosure.scrollIntoViewIfNeeded()
+        await segmentationDisclosure.locator('summary').first().click()
+        await page.waitForTimeout(150)
+        await auditInteractiveNames(page, 'open segmentation lab')
+        await segmentationDisclosure.locator('.ai-lab-run-surface').scrollIntoViewIfNeeded()
+        await page.screenshot({ path: path.join(outputDir, 'ai-segmentation.png') })
+      }
       auditedWorkspaces.push(workspace)
     }
 
@@ -203,21 +333,27 @@ async function main() {
     schema_version: 1,
     base_url: args.baseUrl,
     started_at: new Date().toISOString(),
+    landing_viewports: [],
     viewports: [],
     bootstrap: null,
     status: 'running',
   }
   try {
-    for (const viewport of [
+    const viewports = [
       { width: 390, height: 844 },
       { width: 1366, height: 768 },
       { width: 2560, height: 1080 },
-    ]) {
+    ]
+    for (const viewport of viewports) {
+      evidence.landing_viewports.push(await runLandingViewport(browser, args.baseUrl, outputDir, viewport))
+    }
+    for (const viewport of viewports) {
       evidence.viewports.push(await runViewport(browser, args.baseUrl, outputDir, viewport))
     }
     evidence.bootstrap = await runLoadingAndAdvancedAudit(browser, args.baseUrl, outputDir)
-    const unexpectedConsoleErrors = evidence.viewports.flatMap((item) => item.console_errors)
-    const unexpectedFailedRequests = evidence.viewports.flatMap((item) => item.failed_requests)
+    const auditedPages = [...evidence.landing_viewports, ...evidence.viewports]
+    const unexpectedConsoleErrors = auditedPages.flatMap((item) => item.console_errors)
+    const unexpectedFailedRequests = auditedPages.flatMap((item) => item.failed_requests)
     assert.deepEqual(unexpectedConsoleErrors, [], 'UX audit captured console errors')
     assert.deepEqual(unexpectedFailedRequests, [], 'UX audit captured failed API requests')
     evidence.status = 'passed'

frontend/src/components/GeoMap.tsx

@@ -5,6 +5,7 @@ import 'maplibre-gl/dist/maplibre-gl.css'
 import { NATIONAL_MAP_CENTER, NATIONAL_MAP_ZOOM } from '../config/primaryFocus'
 import { featureCollectionBounds } from '../lib/geojsonBounds'
 import type { MapImageOverlay, MapViewportState, VectorSelectionBBox } from '../types'
+import { basemapGround, basemapPaint, huidigeWerkstand, mapSymbology } from './map/mapSymbology'
 
 interface GeoMapProps {
   data: GeoJSON.FeatureCollection | null
@@ -46,10 +47,23 @@ const DEFAULT_ROAD_BASEMAP_STYLE: maplibregl.StyleSpecification = {
     },
   },
   layers: [
+    {
+      // Grondtoon onder de tegels. Zonder deze laag flitst er wit tussen
+      // tegels die nog niet geladen zijn.
+      id: 'basemap-ground',
+      type: 'background',
+      paint: { 'background-color': basemapGround(huidigeWerkstand()) },
+    },
     {
       id: 'osm-standard',
       type: 'raster',
       source: 'osm-standard',
+      // De tegel wordt ontkleurd en gedempt tot een operationele ondergrond,
+      // zodat alleen de eigen data nog kleur draagt. Geen andere tegelbron en
+      // geen sleutel nodig; wie een echte vectorstijl heeft zet die via
+      // VITE_MAP_STYLE_URL en omzeilt dit blok volledig. Zie basemapPaint voor
+      // het verschil tussen de twee werkstanden.
+      paint: basemapPaint(huidigeWerkstand()),
     },
   ],
 }
@@ -58,18 +72,18 @@ function datasetFillColor(fallbackColor: string): ExpressionSpecification {
   return [
     'case',
     ['==', ['get', 'layer_type'], 'municipality_boundary'],
-    '#0f766e',
+    mapSymbology.boundary,
     [
       'match',
       ['get', 'change_type'],
       'added',
-      '#16a34a',
+      mapSymbology.added,
       'removed',
-      '#dc2626',
+      mapSymbology.removed,
       'modified',
-      '#d97706',
+      mapSymbology.modified,
       'unchanged',
-      '#2563eb',
+      mapSymbology.unchanged,
       fallbackColor,
     ],
   ]
@@ -79,18 +93,18 @@ function datasetLineColor(fallbackColor: string): ExpressionSpecification {
   return [
     'case',
     ['==', ['get', 'layer_type'], 'municipality_boundary'],
-    '#0f5f59',
+    mapSymbology.boundaryStrong,
     [
       'match',
       ['get', 'change_type'],
       'added',
-      '#15803d',
+      mapSymbology.added,
       'removed',
-      '#b91c1c',
+      mapSymbology.removed,
       'modified',
-      '#b45309',
+      mapSymbology.modified,
       'unchanged',
-      '#1d4ed8',
+      mapSymbology.unchanged,
       fallbackColor,
     ],
   ]
@@ -144,8 +158,8 @@ function bboxToFeatureCollection(
 
 function GeoMap({
   data,
-  dataFillColor = '#f97316',
-  dataLineColor = '#ea580c',
+  dataFillColor = mapSymbology.dataFill,
+  dataLineColor = mapSymbology.dataLine,
   areaData = null,
   selectedFeature = null,
   selectionData = null,
@@ -236,6 +250,27 @@ function GeoMap({
     }
   }, [bboxSelectionMode])
 
+  // De kaart wordt eenmalig opgebouwd, dus bij het wisselen van werkstand moet
+  // alleen de verf van de ondergrond mee. setPaintProperty laat alle datalagen
+  // ongemoeid; een volledige setStyle zou ze opnieuw moeten opbouwen.
+  useEffect(() => {
+    const pasAan = () => {
+      const map = mapRef.current
+      if (!map || !map.isStyleLoaded()) return
+      const werkstand = huidigeWerkstand()
+      if (!map.getLayer('osm-standard')) return
+      for (const [naam, waarde] of Object.entries(basemapPaint(werkstand))) {
+        map.setPaintProperty('osm-standard', naam as never, waarde as never)
+      }
+      if (map.getLayer('basemap-ground')) {
+        map.setPaintProperty('basemap-ground', 'background-color', basemapGround(werkstand))
+      }
+    }
+    const waarnemer = new MutationObserver(pasAan)
+    waarnemer.observe(document.body, { attributes: true, attributeFilter: ['data-theme'] })
+    return () => waarnemer.disconnect()
+  }, [])
+
   useEffect(() => {
     if (!containerRef.current || mapRef.current) {
       return
@@ -491,7 +526,7 @@ function GeoMap({
           type: 'fill',
           source: 'area',
           paint: {
-            'fill-color': '#0f766e',
+            'fill-color': mapSymbology.boundary,
             'fill-opacity': 0.18,
           },
         },
@@ -503,7 +538,7 @@ function GeoMap({
           type: 'line',
           source: 'area',
           paint: {
-            'line-color': '#0f766e',
+            'line-color': mapSymbology.boundary,
             'line-width': 3,
             'line-dasharray': [2, 1],
           },
@@ -576,7 +611,7 @@ function GeoMap({
       source: 'selected-feature',
       filter: ['match', ['geometry-type'], ['Polygon', 'MultiPolygon'], true, false],
       paint: {
-        'fill-color': '#fde047',
+        'fill-color': mapSymbology.selectionFill,
         'fill-opacity': 0.32,
       },
     })
@@ -586,7 +621,7 @@ function GeoMap({
       source: 'selected-feature',
       filter: ['match', ['geometry-type'], ['Polygon', 'MultiPolygon', 'LineString', 'MultiLineString'], true, false],
       paint: {
-        'line-color': '#854d0e',
+        'line-color': mapSymbology.selectionLine,
         'line-width': 4,
       },
     })
@@ -596,9 +631,9 @@ function GeoMap({
       source: 'selected-feature',
       filter: ['match', ['geometry-type'], ['Point', 'MultiPoint'], true, false],
       paint: {
-        'circle-color': '#fde047',
+        'circle-color': mapSymbology.selectionFill,
         'circle-radius': 7,
-        'circle-stroke-color': '#854d0e',
+        'circle-stroke-color': mapSymbology.selectionLine,
         'circle-stroke-width': 2,
       },
     })
@@ -620,7 +655,7 @@ function GeoMap({
         type: 'fill',
         source: 'selection-bbox',
         paint: {
-          'fill-color': '#38bdf8',
+          'fill-color': mapSymbology.waterFill,
           'fill-opacity': 0.12,
         },
       })
@@ -629,7 +664,7 @@ function GeoMap({
         type: 'line',
         source: 'selection-bbox',
         paint: {
-          'line-color': '#0369a1',
+          'line-color': mapSymbology.waterLine,
           'line-width': 2,
           'line-dasharray': [2, 1],
         },
@@ -656,7 +691,7 @@ function GeoMap({
       source: 'selection-result',
       filter: ['match', ['geometry-type'], ['Polygon', 'MultiPolygon'], true, false],
       paint: {
-        'fill-color': '#7c3aed',
+        'fill-color': mapSymbology.detectionFill,
         'fill-opacity': 0.24,
       },
     })
@@ -666,7 +701,7 @@ function GeoMap({
       source: 'selection-result',
       filter: ['match', ['geometry-type'], ['Polygon', 'MultiPolygon', 'LineString', 'MultiLineString'], true, false],
       paint: {
-        'line-color': '#5b21b6',
+        'line-color': mapSymbology.detectionLine,
         'line-width': 3,
       },
     })
@@ -676,9 +711,9 @@ function GeoMap({
       source: 'selection-result',
       filter: ['match', ['geometry-type'], ['Point', 'MultiPoint'], true, false],
       paint: {
-        'circle-color': '#7c3aed',
+        'circle-color': mapSymbology.detectionFill,
         'circle-radius': 6,
-        'circle-stroke-color': '#ffffff',
+        'circle-stroke-color': mapSymbology.pointStroke,
         'circle-stroke-width': 2,
       },
     })
@@ -701,14 +736,14 @@ function GeoMap({
       'match',
       ['get', 'qa_evidence_role'],
       'match_candidate',
-      '#2563eb',
+      mapSymbology.unchanged,
       'match_reference',
-      '#0f766e',
+      mapSymbology.boundary,
       'false_positive',
-      '#dc2626',
+      mapSymbology.removed,
       'false_negative',
-      '#d97706',
-      '#475569',
+      mapSymbology.modified,
+      mapSymbology.fallback,
     ] as ExpressionSpecification
     map.addLayer({
       id: 'qa-evidence-fill',
@@ -746,7 +781,7 @@ function GeoMap({
       paint: {
         'circle-color': evidenceColor,
         'circle-radius': 7,
-        'circle-stroke-color': '#ffffff',
+        'circle-stroke-color': mapSymbology.pointStroke,
         'circle-stroke-width': 2,
       },
     })
@@ -762,4 +797,8 @@ function GeoMap({
   )
 }
 
+// Geen React.memo hier. Het is geprobeerd en het scheelde niets: van de
+// negentien props worden er te veel per render opnieuw gemaakt, dus de
+// vergelijking slaat nooit over. Zinvol wordt dat pas wanneer die props
+// gestabiliseerd zijn; tot die tijd is het schijnzekerheid.
 export default GeoMap

frontend/src/components/analysis/ChangeDetectionPanel.tsx

@@ -136,7 +136,7 @@ export function ChangeDetectionPanel({
         </div>
       ) : null}
 
-      {result?.warnings.length ? (
+      {result?.warnings?.length ? (
         <div className="change-detection-warning-surface">
           <strong>Aandachtspunten</strong>
           <ul className="compact-list">

frontend/src/components/auth/LandingPage.tsx

@@ -33,21 +33,18 @@ interface LandingPageProps {
 const capabilityItems = [
   {
     icon: MapPinned,
-    number: '01',
     title: 'Eén kaartgerichte werkruimte',
     description:
       'Selecteer een gebied in België of de Belgische Noordzee en werk verder vanuit dezelfde ruimtelijke context.',
   },
   {
     icon: Database,
-    number: '02',
     title: 'Bronnen blijven herkenbaar',
     description:
       'Autoriteit, meetmoment, dekking, CRS en beperkingen blijven zichtbaar in plaats van achter één generieke kaartlaag te verdwijnen.',
   },
   {
     icon: ShieldCheck,
-    number: '03',
     title: 'Kwaliteit vóór resultaat',
     description:
       'Vergelijk referentie- en kandidaatgegevens, controleer bewijs en exporteer pas wanneer de context klopt.',
@@ -70,6 +67,7 @@ export function LandingPage({
   const [password, setPassword] = useState('')
   const [pendingAction, setPendingAction] = useState<'operator' | 'guest' | null>(null)
   const [authError, setAuthError] = useState<string | null>(null)
+  const [attempted, setAttempted] = useState(false)
   const [showPassword, setShowPassword] = useState(false)
   const [menuOpen, setMenuOpen] = useState(false)
   const usernameRef = useRef<HTMLInputElement | null>(null)
@@ -81,9 +79,19 @@ export function LandingPage({
     return () => document.body.classList.remove('landing-body')
   }, [])
 
+  const scrollAccessPanelIntoView = () => {
+    if (typeof accessPanelRef.current?.scrollIntoView !== 'function') return
+    const reducedMotion = window.matchMedia?.('(prefers-reduced-motion: reduce)').matches ?? false
+    accessPanelRef.current.scrollIntoView({
+      behavior: reducedMotion ? 'auto' : 'smooth',
+      block: 'center',
+    })
+  }
+
   const submitLogin = async (event: FormEvent<HTMLFormElement>) => {
     event.preventDefault()
     setPendingAction('operator')
+    setAttempted(true)
     setAuthError(null)
     try {
       const session = await login(username.trim(), password)
@@ -98,10 +106,9 @@ export function LandingPage({
   const submitGuestLogin = async () => {
     setMenuOpen(false)
     setPendingAction('guest')
+    setAttempted(true)
     setAuthError(null)
-    if (typeof accessPanelRef.current?.scrollIntoView === 'function') {
-      accessPanelRef.current.scrollIntoView({ behavior: 'smooth', block: 'center' })
-    }
+    scrollAccessPanelIntoView()
     try {
       const session = await loginAsGuest()
       onAuthenticated(session)
@@ -114,9 +121,7 @@ export function LandingPage({
 
   const focusLogin = () => {
     setMenuOpen(false)
-    if (typeof accessPanelRef.current?.scrollIntoView === 'function') {
-      accessPanelRef.current.scrollIntoView({ behavior: 'smooth', block: 'center' })
-    }
+    scrollAccessPanelIntoView()
     window.requestAnimationFrame(() => usernameRef.current?.focus())
   }
 
@@ -278,7 +283,7 @@ export function LandingPage({
                     </button>
                   </div>
 
-                  {authError || serviceError ? (
+                  {authError || (serviceError && attempted) ? (
                     <p className="landing-login-error" role="alert">{authError ?? serviceError}</p>
                   ) : null}
 
@@ -290,6 +295,13 @@ export function LandingPage({
                     <LogIn aria-hidden="true" />
                     {pendingAction === 'operator' ? 'Veilig aanmelden…' : 'Inloggen als operator'}
                   </button>
+
+                  {/* De storingsmelding stond als rood blok midden in de hero,
+                      voordat de bezoeker iets gedaan had. Zolang er nog niets
+                      geprobeerd is, is het een mededeling en geen fout. */}
+                  {serviceError && !attempted && !authError ? (
+                    <p className="landing-login-note">{serviceError}</p>
+                  ) : null}
                 </form>
 
                 {guestAccessEnabled ? (
@@ -326,11 +338,10 @@ export function LandingPage({
           </div>
 
           <div className="landing-capability-grid">
-            {capabilityItems.map(({ icon: Icon, number, title, description }) => (
+            {capabilityItems.map(({ icon: Icon, title, description }) => (
               <article key={title} className="landing-capability">
                 <div className="landing-capability-topline">
                   <span className="landing-capability-icon" aria-hidden="true"><Icon /></span>
-                  <small>{number}</small>
                 </div>
                 <h3>{title}</h3>
                 <p>{description}</p>

frontend/src/components/auth/LandingProjectStory.tsx

@@ -1,6 +1,7 @@
 import { useState } from 'react'
 import { BadgeCheck, Database, Download, MapPinned, ScanSearch } from 'lucide-react'
 import '../../styles/landing-project-story.css'
+import { useDeferredBackground } from '../../hooks/useDeferredBackground'
 
 const stages = [
   {
@@ -46,6 +47,7 @@ const stages = [
 ] as const
 
 export function LandingProjectStory(): JSX.Element {
+  const kaartRef = useDeferredBackground<HTMLDivElement>()
   const [activeIndex, setActiveIndex] = useState(0)
   const activeStage = stages[activeIndex]
 
@@ -104,7 +106,7 @@ export function LandingProjectStory(): JSX.Element {
       </div>
 
       <div className={`landing-story-visual is-stage-${activeIndex + 1}`} aria-hidden="true">
-        <div className="landing-story-map" />
+        <div className="landing-story-map" ref={kaartRef} />
         <svg viewBox="0 0 720 610" role="presentation">
           <defs>
             <linearGradient id="story-area" x1="0" y1="0" x2="1" y2="1">

frontend/src/components/brand/ItWorxSignature.tsx

@@ -2,7 +2,7 @@ export function ItWorxSignature(): JSX.Element {
   return (
     <div className="itworx-signature" aria-label="Ontwikkeld door Jens van ITWorx.tech">
       <span>Ontwikkeld door Jens</span>
-      <img src="/itworx-wordmark.png" alt="ITWorx.tech" />
+      <img src="/itworx-wordmark.webp" alt="ITWorx.tech" />
     </div>
   )
 }

frontend/src/components/datasets/DatasetPanel.tsx

@@ -172,28 +172,24 @@ export function DatasetPanel({
       key: 'selected',
       label: 'Geselecteerd',
       count: selectedDatasetId ? 1 : 0,
-      hint: 'Actief',
       className: 'dataset-role-selected',
     },
     {
       key: 'reference',
       label: 'Referentie',
       count: primaryDatasets.filter((dataset) => normalizeDatasetRole(dataset) === 'reference').length,
-      hint: 'Officieel',
       className: 'dataset-role-reference',
     },
     {
       key: 'candidate',
       label: 'Resultaat',
       count: primaryDatasets.filter((dataset) => normalizeDatasetRole(dataset) === 'candidate').length,
-      hint: 'Afgeleid',
       className: 'dataset-role-candidate',
     },
     {
       key: 'source',
       label: 'Basisbron',
       count: primaryDatasets.filter((dataset) => normalizeDatasetRole(dataset) === 'source').length,
-      hint: 'Ingeladen',
       className: 'dataset-role-source',
     },
   ]
@@ -274,12 +270,11 @@ export function DatasetPanel({
         </form>
       </details>
 
-      <div className="dataset-role-summary-grid" aria-label="Dataset role summary">
+      <div className="dataset-role-summary-grid" aria-label="Overzicht van bronrollen">
         {roleSummaries.map((summary) => (
           <div className={`dataset-role-summary ${summary.className}`} key={summary.key}>
-            <span>{summary.label}</span>
             <strong>{summary.count}</strong>
-            <small>{summary.hint}</small>
+            <span>{summary.label}</span>
           </div>
         ))}
       </div>

frontend/src/components/detection/AiPipelineIllustration.test.tsx

@@ -17,10 +17,51 @@ describe('AiPipelineIllustration', () => {
       />,
     )
 
-    expect(screen.getByText('CUDA gereed')).toBeTruthy()
+    expect(screen.getByText('GPU gereed')).toBeTruthy()
     expect(screen.getByRole('tab', { name: /Detecties/ }).textContent).toContain('volgende stap')
 
-    fireEvent.click(screen.getByRole('tab', { name: /NVIDIA GPU/ }))
-    expect(screen.getByRole('tabpanel').textContent).toContain('Lokale PyTorch-inferentie')
+    fireEvent.click(screen.getByRole('tab', { name: /Berekening/ }))
+    expect(screen.getByRole('tabpanel').textContent).toContain('De herkenning draait lokaal')
+  })
+
+  it('moves selection and focus through the tablist with keyboard controls', () => {
+    render(
+      <AiPipelineIllustration
+        hasImagery
+        hasTiles
+        gpuReady
+        hasDetections={false}
+        hasQualityEvidence={false}
+        running={false}
+      />,
+    )
+
+    const tabs = screen.getAllByRole('tab') as HTMLButtonElement[]
+    const selectedTab = screen.getByRole('tab', { name: /Detecties/ }) as HTMLButtonElement
+    const panel = screen.getByRole('tabpanel')
+
+    expect(selectedTab.tabIndex).toBe(0)
+    expect(tabs.filter((tab) => tab.tabIndex === 0)).toHaveLength(1)
+    expect(selectedTab.getAttribute('aria-controls')).toBe(panel.id)
+    expect(panel.getAttribute('aria-labelledby')).toBe(selectedTab.id)
+
+    selectedTab.focus()
+    fireEvent.keyDown(selectedTab, { key: 'ArrowRight' })
+    expect(screen.getByRole('tab', { name: /QA-bewijs/ }).getAttribute('aria-selected')).toBe('true')
+    expect(document.activeElement).toBe(screen.getByRole('tab', { name: /QA-bewijs/ }))
+
+    fireEvent.keyDown(document.activeElement as HTMLElement, { key: 'ArrowRight' })
+    expect(document.activeElement).toBe(screen.getByRole('tab', { name: /Orthofoto/ }))
+
+    fireEvent.keyDown(document.activeElement as HTMLElement, { key: 'End' })
+    expect(document.activeElement).toBe(screen.getByRole('tab', { name: /QA-bewijs/ }))
+
+    fireEvent.keyDown(document.activeElement as HTMLElement, { key: 'Home' })
+    expect(document.activeElement).toBe(screen.getByRole('tab', { name: /Orthofoto/ }))
+
+    fireEvent.keyDown(document.activeElement as HTMLElement, { key: 'ArrowLeft' })
+    const wrappedTab = screen.getByRole('tab', { name: /QA-bewijs/ })
+    expect(document.activeElement).toBe(wrappedTab)
+    expect(screen.getByRole('tabpanel').getAttribute('aria-labelledby')).toBe(wrappedTab.id)
   })
 })

frontend/src/components/detection/AiPipelineIllustration.tsx

@@ -1,4 +1,4 @@
-import { useState } from 'react'
+import { useId, useRef, useState, type KeyboardEvent } from 'react'
 import { BadgeCheck, Boxes, Cpu, Image, ScanSearch } from 'lucide-react'
 
 interface AiPipelineIllustrationProps {
@@ -12,8 +12,8 @@ interface AiPipelineIllustrationProps {
 
 const pipelineStages = [
   { key: 'imagery', label: 'Orthofoto', title: 'Gegeorefereerd bronbeeld', detail: 'CRS, resolutie en ruimtelijke dekking blijven bij de dataset bewaard.', icon: Image },
-  { key: 'tiles', label: 'Beeldtegels', title: 'Controleerbare tilevoorbereiding', detail: 'Overlap en tile-identiteit houden detecties herleidbaar naar hun bronpixel.', icon: Boxes },
-  { key: 'gpu', label: 'NVIDIA GPU', title: 'Lokale PyTorch-inferentie', detail: 'GeoIntel gebruikt de server-GPU en faalt gesloten wanneer CUDA vereist maar niet beschikbaar is.', icon: Cpu },
+  { key: 'tiles', label: 'Beeldtegels', title: 'Beeld opgedeeld in controleerbare tegels', detail: 'Elke tegel houdt zijn overlap en herkomst bij, zodat elke detectie terug te voeren is op de bronpixel.', icon: Boxes },
+  { key: 'gpu', label: 'Berekening', title: 'De herkenning draait lokaal', detail: 'De analyse gebruikt de GPU van de server. Is die niet beschikbaar, dan stopt de analyse in plaats van een resultaat te maken waarop u niet kunt bouwen.', icon: Cpu },
   { key: 'detections', label: 'Detecties', title: 'Gegeorefereerde gebouwobjecten', detail: 'Confidence, modelversie, brontegel en geometrie worden als reproduceerbaar resultaat bewaard.', icon: ScanSearch },
   { key: 'quality', label: 'QA-bewijs', title: 'Controle vóór vrijgave', detail: 'Precision, recall, IoU en foutbewijs bepalen of een resultaat alleen verkennend of operationeel bruikbaar is.', icon: BadgeCheck },
 ] as const
@@ -29,33 +29,69 @@ export function AiPipelineIllustration({
   const readiness = [hasImagery, hasTiles, gpuReady, hasDetections, hasQualityEvidence]
   const firstIncomplete = readiness.findIndex((ready) => !ready)
   const [selectedIndex, setSelectedIndex] = useState(firstIncomplete === -1 ? 4 : firstIncomplete)
+  const tabRefs = useRef<Array<HTMLButtonElement | null>>([])
+  const componentId = useId()
+  const titleId = `${componentId}-title`
+  const panelId = `${componentId}-panel`
   const selected = pipelineStages[selectedIndex]
 
+  const selectAndFocus = (index: number) => {
+    setSelectedIndex(index)
+    tabRefs.current[index]?.focus()
+  }
+
+  const handleTabKeyDown = (event: KeyboardEvent<HTMLButtonElement>, index: number) => {
+    let nextIndex: number | null = null
+
+    switch (event.key) {
+      case 'ArrowRight':
+        nextIndex = (index + 1) % pipelineStages.length
+        break
+      case 'ArrowLeft':
+        nextIndex = (index - 1 + pipelineStages.length) % pipelineStages.length
+        break
+      case 'Home':
+        nextIndex = 0
+        break
+      case 'End':
+        nextIndex = pipelineStages.length - 1
+        break
+      default:
+        return
+    }
+
+    event.preventDefault()
+    selectAndFocus(nextIndex)
+  }
+
   return (
-    <section className={running ? 'ai-pipeline ai-pipeline-running' : 'ai-pipeline'} aria-labelledby="ai-pipeline-title">
+    <section className={running ? 'ai-pipeline ai-pipeline-running' : 'ai-pipeline'} aria-labelledby={titleId}>
       <div className="ai-pipeline-heading">
         <div>
           <p className="eyebrow">Van pixel naar bewijs</p>
-          <h3 id="ai-pipeline-title">PyTorch-keten op de NVIDIA-server</h3>
+          <h3 id={titleId}>Van luchtbeeld naar controleerbare detectie</h3>
           <p>Open een schakel om te zien welke technische context GeoIntel door de volledige analyse bewaart.</p>
         </div>
         <span className={gpuReady ? 'ai-pipeline-gpu ai-pipeline-gpu-ready' : 'ai-pipeline-gpu'}>
-          <i /> {gpuReady ? 'CUDA gereed' : 'CUDA controleren'}
+          <i /> {gpuReady ? 'GPU gereed' : 'GPU controleren'}
         </span>
       </div>
 
-      <div className="ai-pipeline-track" role="tablist" aria-label="PyTorch-analysekten">
+      <div className="ai-pipeline-track" role="tablist" aria-label="Stappen in de analyseketen">
         <span className="ai-pipeline-flow" aria-hidden="true" />
         {pipelineStages.map(({ key, label, icon: Icon }, index) => (
           <button
             key={key}
-            id={`ai-pipeline-${key}`}
+            id={`${componentId}-${key}`}
+            ref={(element) => { tabRefs.current[index] = element }}
             type="button"
             role="tab"
             aria-selected={selectedIndex === index}
-            aria-controls="ai-pipeline-detail"
+            aria-controls={panelId}
+            tabIndex={selectedIndex === index ? 0 : -1}
             className={readiness[index] ? 'ai-pipeline-stage ai-pipeline-stage-ready' : 'ai-pipeline-stage'}
             onClick={() => setSelectedIndex(index)}
+            onKeyDown={(event) => handleTabKeyDown(event, index)}
           >
             <span><Icon aria-hidden="true" /></span>
             <strong>{label}</strong>
@@ -65,10 +101,11 @@ export function AiPipelineIllustration({
       </div>
 
       <div
-        id="ai-pipeline-detail"
+        id={panelId}
         className="ai-pipeline-detail"
         role="tabpanel"
-        aria-labelledby={`ai-pipeline-${selected.key}`}
+        aria-labelledby={`${componentId}-${selected.key}`}
+        tabIndex={0}
         key={selected.key}
       >
         <span>{String(selectedIndex + 1).padStart(2, '0')}</span>

frontend/src/components/detection/DetectionLab.tsx

@@ -6,6 +6,7 @@ import type {
   DetectionRead,
   DetectionRunRead,
   DetectionRunResponse,
+  JobRead,
   ModelAssetRead,
   QualityCheckRead,
   YoloPreflightResponse,
@@ -15,7 +16,7 @@ import { DETECTION_OPERATOR_PROFILES, type DetectionOperatorProfile } from './de
 import { DetectionModelManagement, detectionModelLabel } from './DetectionModelManagement'
 import { AiPipelineIllustration } from './AiPipelineIllustration'
 import { ModelSelector } from '../models/ModelSelector'
-import { toAnalysisModelOption } from '../models/modelOptions'
+import { analysisModelAvailabilityMessage, toAnalysisModelOption } from '../models/modelOptions'
 
 const DETECTION_PAGE_SIZE_OPTIONS = [25, 50, 100] as const
 const DEFAULT_DETECTION_PAGE_SIZE = 50
@@ -87,6 +88,7 @@ interface DetectionLabProps {
   detectionTileManifestPath: string
   detectionConfidenceThreshold: number
   runningDetection: boolean
+  detectionJob: JobRead | null
   detectionRunResult: DetectionRunResponse | null
   detectionRunError: string | null
   detectionRuns: DetectionRunRead[]
@@ -151,6 +153,7 @@ export function DetectionLab({
   detectionTileManifestPath,
   detectionConfidenceThreshold,
   runningDetection,
+  detectionJob,
   detectionRunResult,
   detectionRunError,
   detectionRuns,
@@ -206,14 +209,19 @@ export function DetectionLab({
     (profile) => profile.modelAssetId === selectedModelAssetId,
   ) ?? null
   const yoloRuntimeReady = Boolean(
-    yoloPreflight?.checks.enabled &&
-    yoloPreflight.checks.dependencies_available &&
-    yoloPreflight.checks.model_file_exists,
+    yoloPreflight?.checks?.enabled &&
+    yoloPreflight.checks?.dependencies_available &&
+    yoloPreflight.checks?.accelerator_ready === true &&
+    yoloPreflight.checks?.model_file_exists,
   )
   const detectionRequiresTileManifest = selectedDetectionModelId === 'yolo-configured'
+  const detectionJobActive = detectionJob?.status === 'queued' || detectionJob?.status === 'running'
   const detectionHasDataset = selectedDetectionDatasetId.length > 0
   const detectionHasModel = selectedDetectionModel !== null
   const detectionModelReady = Boolean(selectedDetectionModel?.configured)
+  const selectedDetectionModelAvailability = selectedDetectionModel
+    ? analysisModelAvailabilityMessage(selectedDetectionModel)
+    : 'Het gekozen model is niet geconfigureerd'
   const detectionModelUiRunnable = detectionModelReady && selectedDetectionModelId !== 'manual-fixture-detector'
   const detectionHasExplicitModelAsset =
     selectedDetectionModelId !== 'yolo-configured' || modelAssets.length === 0 || selectedModelAssetId.length > 0
@@ -259,7 +267,7 @@ export function DetectionLab({
         : selectedDetectionModelId === 'manual-fixture-detector'
           ? 'Het fixturemodel is alleen bedoeld voor expliciete tests en demo\'s'
           : !detectionModelReady
-            ? selectedDetectionModel?.limitation_message ?? 'Het gekozen model is niet geconfigureerd'
+            ? selectedDetectionModelAvailability
             : !detectionHasExplicitModelAsset
               ? 'Kies een lokaal modelbestand onder beheer'
             : !detectionHasTileManifest
@@ -275,7 +283,7 @@ export function DetectionLab({
         : selectedDetectionModelId === 'manual-fixture-detector'
           ? 'Het fixturemodel is alleen bedoeld voor expliciete tests en demo\'s'
           : !detectionModelReady
-            ? selectedDetectionModel?.limitation_message ?? 'Het gekozen model is niet geconfigureerd'
+            ? selectedDetectionModelAvailability
             : !detectionHasExplicitModelAsset
               ? 'Kies een lokaal modelbestand onder beheer'
               : null
@@ -308,7 +316,7 @@ export function DetectionLab({
           <p>{selectedOperatorProfile?.displayName ?? selectedModelAsset?.display_name ?? 'Lokaal YOLO-model'}</p>
         </div>
         <div className={yoloRuntimeReady ? 'ai-user-summary-card ai-user-summary-card-ready' : 'ai-user-summary-card'}>
-          <span>PyTorch-runtime</span>
+          <span>Rekenomgeving</span>
           <strong>{yoloRuntimeReady ? 'Gereed' : loadingDetectionModels ? 'Controleren...' : 'Niet gereed'}</strong>
           <p>{yoloRuntimeReady ? `${yoloPreflight?.runtime.cuda_available ? 'GPU' : 'CPU'} · lokaal model gevonden` : 'Controleer de modelconfiguratie onder beheer.'}</p>
         </div>
@@ -499,8 +507,8 @@ export function DetectionLab({
             <DetectionWorkflowStep label="3. Modelcontrole" complete={detectionWorkflowStage === 'detecting' || detectionWorkflowStage === 'loading' || detectionWorkflowStage === 'complete'} active={detectionWorkflowStage === 'validating'} />
             <DetectionWorkflowStep label="4. Resultaat" complete={detectionWorkflowStage === 'complete'} active={detectionWorkflowStage === 'detecting' || detectionWorkflowStage === 'loading'} />
           </div>
-          <button className="primary-action guided-detection-action" type="button" onClick={onPrepareAndRunDetection} disabled={runningDetection || !guidedDetectionReady}>
-            {detectionWorkflowActionLabel(detectionWorkflowStage)}
+          <button className="primary-action guided-detection-action" type="button" onClick={onPrepareAndRunDetection} disabled={runningDetection || runningDetectionCalibration || detectionJobActive || !guidedDetectionReady}>
+            {detectionWorkflowActionLabel(detectionWorkflowStage, detectionJob?.status)}
           </button>
 
           {!managementLocked ? <details className="ai-lab-model-surface technical-manifest-surface" aria-label="Technische tegelinstellingen">
@@ -528,7 +536,7 @@ export function DetectionLab({
                   <span>De technische controle wordt vernieuwd wanneer het model of tegelbestand wijzigt.</span>
                 </div>
               ) : null}
-              <button className="secondary-action" type="button" onClick={onRunDetection} disabled={runningDetection || !detectionRunReady}>
+              <button className="secondary-action" type="button" onClick={onRunDetection} disabled={runningDetection || runningDetectionCalibration || detectionJobActive || !detectionRunReady}>
                 Bestaande beeldtegels analyseren
               </button>
             </div>
@@ -537,15 +545,26 @@ export function DetectionLab({
       </div>
 
       <div className="ai-lab-state-stack">
+        {detectionJob && (detectionJob.status === 'queued' || detectionJob.status === 'running') ? (
+          <div className="result-state" role="status" aria-live="polite">
+            <strong>{detectionJob.status === 'queued' ? 'GPU-taak staat in de wachtrij.' : 'GPU-analyse wordt uitgevoerd.'}</strong>
+            <p>
+              {detectionJob.status === 'queued'
+                ? 'De server heeft de aanvraag veilig bewaard en start ze zodra de NVIDIA-worker beschikbaar is.'
+                : 'Het model verwerkt de beeldtegels op de server. Dit scherm volgt de bewaarde taak automatisch.'}
+            </p>
+            <span className="muted">Taak-ID: {detectionJob.id}</span>
+          </div>
+        ) : null}
         {detectionRunError ? (
-          <div className="result-state result-state-error">
-            <strong>De beeldanalyse is mislukt.</strong>
+          <div className="result-state result-state-error" role="alert">
+            <strong>{detectionJobActive ? 'Het volgen van de servertaak is onderbroken.' : 'De beeldanalyse is mislukt.'}</strong>
             <p>{detectionRunError}</p>
           </div>
         ) : null}
         {detectionRunResult ? (
-          <div className="result-summary-card">
-            <p>Status: {detectionRunResult.status === 'completed' ? 'afgerond' : detectionRunResult.status}</p>
+          <div className={detectionRunResult.detection_count === 0 ? 'result-state result-state-warning' : 'result-summary-card'} role="status">
+            <p>Status: {detectionStatusLabel(detectionRunResult.status)}</p>
             <p>{detectionRunResult.message}</p>
             <p>Gevonden objecten: {detectionRunResult.detection_count}</p>
             {detectionRunResult.error_code ? <p className="error">Code: {detectionRunResult.error_code}</p> : null}
@@ -602,7 +621,7 @@ export function DetectionLab({
           className="primary-action"
           type="button"
           onClick={onRunCalibration}
-          disabled={runningDetectionCalibration || !calibrationRunReady}
+          disabled={runningDetectionCalibration || runningDetection || detectionJobActive || !calibrationRunReady}
         >
           Drempels vergelijken
         </button>
@@ -927,7 +946,7 @@ export function DetectionLab({
       ) : null}
       {detectionQaResult ? (
           <div className="result-summary-card">
-            <p>Status: {detectionQaResult.status === 'completed' ? 'afgerond' : detectionQaResult.status}</p>
+            <p>Status: {detectionStatusLabel(detectionQaResult.status)}</p>
             <p>Precisie: {detectionQaResult.precision?.toFixed(3) ?? 'n.v.t.'}</p>
             <p>Herkenningsgraad: {detectionQaResult.recall?.toFixed(3) ?? 'n.v.t.'}</p>
             <p>F1: {detectionQaResult.f1_score?.toFixed(3) ?? 'n.v.t.'}</p>
@@ -1042,10 +1061,11 @@ function DetectionWorkflowStep({
   )
 }
 
-function detectionWorkflowActionLabel(stage: DetectionWorkflowStage): string {
+function detectionWorkflowActionLabel(stage: DetectionWorkflowStage, jobStatus?: string): string {
   if (stage === 'tiling') return 'Beeldtegels voorbereiden...'
   if (stage === 'validating') return 'Model en beeld controleren...'
-  if (stage === 'detecting') return 'Gebouwen zoeken...'
+  if (stage === 'detecting' && jobStatus === 'queued') return 'Wachten op NVIDIA GPU...'
+  if (stage === 'detecting') return 'Gebouwen zoeken op NVIDIA GPU...'
   if (stage === 'loading') return 'Resultaat op kaart laden...'
   if (stage === 'complete') return 'Analyse opnieuw uitvoeren'
   return 'Gebouwen zoeken en op kaart tonen'

frontend/src/components/detection/DetectionModelManagement.tsx

@@ -4,6 +4,7 @@ import type {
   YoloPreflightResponse,
 } from '../../types'
 import { DETECTION_OPERATOR_PROFILES, type DetectionOperatorProfile } from './detectionProfiles'
+import { analysisModelAvailabilityMessage } from '../models/modelOptions'
 
 interface DetectionModelManagementProps {
   detectionModels: DetectionModelCapability[]
@@ -39,6 +40,8 @@ function statusLabel(value: string): string {
   if (value === 'configured' || value === 'ready') return 'gereed'
   if (value === 'not_configured') return 'niet geconfigureerd'
   if (value === 'dependency_unavailable') return 'software ontbreekt'
+  if (value === 'accelerator_unavailable') return 'GPU niet beschikbaar'
+  if (value === 'contract_incomplete') return 'provenance onvolledig'
   return value.replace(/_/g, ' ')
 }
 
@@ -65,6 +68,7 @@ export function DetectionModelManagement({
   const yoloRuntimeReady = Boolean(
     yoloPreflight?.checks.enabled
       && yoloPreflight.checks.dependencies_available
+      && yoloPreflight.checks.accelerator_ready === true
       && yoloPreflight.checks.model_file_exists,
   )
 
@@ -110,7 +114,7 @@ export function DetectionModelManagement({
                   {statusLabel(model.status)}
                 </span>
                 <p className="muted">Ondersteunde klassen: {model.supported_classes.join(', ') || 'niet opgegeven'}</p>
-                <p className="muted">{model.limitation_message}</p>
+                <p className="muted">{analysisModelAvailabilityMessage(model)}</p>
                 <details className="technical-inline-details">
                   <summary>Technische identificatie</summary>
                   <div className="entity-meta">

frontend/src/components/exports/ExportCenter.tsx

@@ -193,7 +193,7 @@ export function ExportCenter({
           <span className="count-pill">{exports.length} bestanden</span>
         </div>
 
-        <div className="export-summary-surface" aria-label="Export summary">
+        <div className="export-summary-surface" aria-label="Samenvatting van de downloads">
           <div className="quality-summary-grid">
             <div>
               <span>GeoJSON</span>
@@ -210,7 +210,7 @@ export function ExportCenter({
           </div>
         </div>
 
-        <div className="export-handoff-surface" aria-label="Export handoff readiness">
+        <div className="export-handoff-surface" aria-label="Gereedheid voor overdracht">
           <div className="handoff-summary-card">
             <div className="panel-title-row">
               <div>
@@ -275,14 +275,14 @@ export function ExportCenter({
             })}
             {availableLatestArtifacts.length === 0 ? (
               <div className="result-state result-state-empty latest-download-empty">
-                <strong>Nog geen downloads gemaakt</strong>
-                <p>Kies hieronder een rapport of de actieve kaartlaag.</p>
+                <strong>Nog geen recente downloads</strong>
+                <p>De laatst bewaarde bestanden verschijnen hier.</p>
               </div>
             ) : null}
           </div>
         </div>
 
-        <div className="export-actions-surface" aria-label="Export artifact actions">
+        <div className="export-actions-surface" aria-label="Acties om resultaten te bewaren">
           <div className="panel-title-row">
             <div>
               <h3>Wat wil je bewaren?</h3>
@@ -377,13 +377,13 @@ export function ExportCenter({
           ) : null}
           {exports.length === 0 ? (
             <div className="result-state result-state-empty">
-              <strong>Nog geen downloads gemaakt.</strong>
-              <p>Kies hierboven een leesbaar rapport, projectoverzicht of kaartlaag.</p>
+              <strong>Nog niets bewaard</strong>
+              <p>Maak een leesbaar rapport, een projectoverzicht, of bewaar de actieve kaartlaag.</p>
             </div>
           ) : null}
         </div>
 
-        <details className="export-history-surface export-history-disclosure" aria-label="Export history">
+        <details className="export-history-surface export-history-disclosure" aria-label="Downloadgeschiedenis">
           <summary>
             <span>Downloadgeschiedenis</span>
             <strong>{exports.length} bestanden</strong>
@@ -394,7 +394,7 @@ export function ExportCenter({
             <p className="muted">Bekijk persistente bestanden en open beschikbare JSON-voorbeelden.</p>
           </div>
           {exports.length > 0 ? (
-            <div className="export-history-controls" aria-label="Export history filters">
+            <div className="export-history-controls" aria-label="Filters op de downloadgeschiedenis">
               <label>
                 Downloads zoeken
                 <input

frontend/src/components/exports/ExportPreview.tsx

@@ -33,7 +33,7 @@ export function ExportPreview({ content }: ExportPreviewProps): JSX.Element {
       </div>
       {content ? (
         <>
-          <div className="export-preview-summary" aria-label="Export preview summary">
+          <div className="export-preview-summary" aria-label="Samenvatting van het voorbeeld">
             <div className="export-preview-summary-card">
               <span>Type inhoud</span>
               <strong>{previewStats?.rootType}</strong>

frontend/src/components/inspector/WorkbenchInspector.tsx

@@ -189,7 +189,7 @@ export function WorkbenchInspector({
             <InspectorField label="Type controle" value={latestQualityCheck?.check_type?.replaceAll('_', ' ')} />
             <InspectorField label="Status" value={latestQualityCheck?.status} />
             <InspectorField label="Score" value={latestQualityCheck?.score} />
-            <InspectorField label="Meetwaarden" value={latestQualityCheck?.metrics.length} />
+            <InspectorField label="Meetwaarden" value={latestQualityCheck?.metrics?.length} />
             <div className="button-row">
               <button type="button" className="secondary-action" onClick={onOpenQualityWorkspace}>
                 Kwaliteit openen

frontend/src/components/map/MapAdvancedWorkbench.tsx

@@ -887,7 +887,7 @@ export function MapAdvancedWorkbench({ props, view }: MapAdvancedWorkbenchProps)
                 <p className="muted">Bewaarde afgeleide laag: {latestSelectionDatasetName}</p>
               ) : null}
               {latestSelectionDatasetName ? (
-                <div className="map-selection-qa-surface" aria-label="Map selection QA shortcut">
+                <div className="map-selection-qa-surface" aria-label="Snelkoppeling naar de kwaliteitscontrole van de selectie">
                   <label>
                     Referentielaag
                     <select
@@ -913,7 +913,7 @@ export function MapAdvancedWorkbench({ props, view }: MapAdvancedWorkbenchProps)
                   </button>
                   {mapSelectionQaError ? <p className="error">{mapSelectionQaError}</p> : null}
                   {mapSelectionQaResult ? (
-                    <div className="map-selection-qa-evidence" aria-label="Map selection QA result">
+                    <div className="map-selection-qa-evidence" aria-label="Kwaliteitsresultaat van de kaartselectie">
                       <div className="panel-title-row">
                         <div>
                           <p className="eyebrow">Kaartbewijs</p>
@@ -977,7 +977,7 @@ export function MapAdvancedWorkbench({ props, view }: MapAdvancedWorkbenchProps)
                 </div>
               ) : null}
               {areaSelectionPreviewFeatures.length > 0 ? (
-                <div className="table-scroll feature-property-table" aria-label="Area selection feature table">
+                <div className="table-scroll feature-property-table" aria-label="Tabel met objecten in de gebiedsselectie">
                   <table>
                     <thead>
                       <tr>

frontend/src/components/map/MapExplorerView.tsx

@@ -16,6 +16,7 @@ import { datasetCoversSelectedArea, datasetProductKey, floodScenarioLabel, forma
 import type { MapWorkspaceProps } from './mapWorkspaceProps'
 
 import type { MapWorkspaceViewModel } from './useMapWorkspaceViewModel'
+import { ThemeSearchField } from './ThemeSearchField'
 
 interface MapExplorerViewProps {
   props: MapWorkspaceProps
@@ -254,6 +255,14 @@ export function MapExplorerView({ props, view }: MapExplorerViewProps): JSX.Elem
     visibleThemes,
     walloniaScopeSelected,
   } = view
+  const resultsError = (
+    analysisMode === 'evolution'
+      ? [temporalComparisonError]
+      : [mapSelectionError, themeResultsError]
+  )
+    .filter((message): message is string => Boolean(message))
+    .filter((message, index, messages) => messages.indexOf(message) === index)
+    .join(' ')
 
     return (
       <section
@@ -369,16 +378,7 @@ export function MapExplorerView({ props, view }: MapExplorerViewProps): JSX.Elem
                     : 'Zoek optioneel een gemeente of teken vrij op de kaart'}
               </small>
             </div>
-            <label className="geo-theme-search">
-              <span className="sr-only">Zoek een thema of gegevensbron</span>
-              <Search aria-hidden="true" />
-              <input
-                type="search"
-                value={themeFilter}
-                onChange={(event) => setThemeFilter(event.target.value)}
-                placeholder="Zoek thema’s"
-              />
-            </label>
+            <ThemeSearchField waarde={themeFilter} onChange={setThemeFilter} />
             <div className="geo-theme-list">
               {visibleThemes.map((theme) => {
                 const dataset = themeDatasetMap[theme.id]
@@ -414,7 +414,7 @@ export function MapExplorerView({ props, view }: MapExplorerViewProps): JSX.Elem
                                 : 'Niet beschikbaar'}
                       </small>
                     </span>
-                    <i>{active ? 'Gekozen' : available ? 'Kies' : '—'}</i>
+                    <i>{workspaceLoading ? 'Laden' : active ? 'Gekozen' : available ? 'Kies' : '—'}</i>
                   </button>
                 )
               })}
@@ -867,6 +867,25 @@ export function MapExplorerView({ props, view }: MapExplorerViewProps): JSX.Elem
                 <span />
                 <strong>De gekozen bronnen worden begrensd geladen en geanalyseerd…</strong>
               </div>
+            ) : resultsError ? (
+              <div className="geo-results-error" role="alert">
+                <strong>De analyse kon niet worden voltooid</strong>
+                <p>{resultsError}</p>
+                <button
+                  className="secondary-action"
+                  type="button"
+                  disabled={analysisMode === 'evolution' ? !temporalSelectionValid : selectedThemes.length === 0}
+                  onClick={() => {
+                    if (analysisMode === 'evolution') {
+                      runTemporalComparison()
+                    } else if (mapSelectionBbox) {
+                      void analyzeSelection(mapSelectionBbox, areaIdForSelection(mapSelectionBbox))
+                    }
+                  }}
+                >
+                  Opnieuw proberen
+                </button>
+              </div>
             ) : analysisMode === 'current' && themeInsights.length === 0 && !mapSelectionResult ? (
               <div className="geo-results-empty">
                 <strong>Nog niet geanalyseerd</strong>
@@ -1027,10 +1046,6 @@ export function MapExplorerView({ props, view }: MapExplorerViewProps): JSX.Elem
                 {analysisMode === 'current' && activeSelectionResult?.summary?.warning ? (
                   <p className="geo-data-notice">{activeSelectionResult.summary.warning}</p>
                 ) : null}
-                {mapSelectionError ? <p className="error">{mapSelectionError}</p> : null}
-                {themeResultsError ? <p className="error">{themeResultsError}</p> : null}
-                {temporalComparisonError ? <p className="error">{temporalComparisonError}</p> : null}
-
                 {analysisMode === 'current' && selectedResultProperties.length > 0 ? (
                   <details className="geo-result-details">
                     <summary>Kenmerken van de gevonden objecten</summary>

frontend/src/components/map/ThemeSearchField.test.tsx

@@ -0,0 +1,54 @@
+import { cleanup, fireEvent, render, screen } from '@testing-library/react'
+import { afterEach, describe, expect, it, vi } from 'vitest'
+import { ThemeSearchField } from './ThemeSearchField'
+
+describe('ThemeSearchField', () => {
+  afterEach(() => {
+    cleanup()
+    vi.useRealTimers()
+  })
+
+  it('toont wat de gebruiker typt zonder daarop te wachten', () => {
+    vi.useFakeTimers()
+    const onChange = vi.fn()
+    render(<ThemeSearchField waarde="" onChange={onChange} />)
+    const veld = screen.getByRole('searchbox')
+
+    fireEvent.change(veld, { target: { value: 'beb' } })
+    expect((veld as HTMLInputElement).value).toBe('beb')
+    // De boven­liggende werkruimte weet er nog niets van; die hertekende
+    // voorheen bij elke letter.
+    expect(onChange).not.toHaveBeenCalled()
+  })
+
+  it('geeft de waarde één keer door wanneer het typen stopt', () => {
+    vi.useFakeTimers()
+    const onChange = vi.fn()
+    render(<ThemeSearchField waarde="" onChange={onChange} />)
+    const veld = screen.getByRole('searchbox')
+
+    for (const tekst of ['b', 'be', 'beb', 'bebo', 'bebou', 'bebouw']) {
+      fireEvent.change(veld, { target: { value: tekst } })
+      vi.advanceTimersByTime(40)
+    }
+    expect(onChange).not.toHaveBeenCalled()
+
+    vi.advanceTimersByTime(200)
+    expect(onChange).toHaveBeenCalledTimes(1)
+    expect(onChange).toHaveBeenCalledWith('bebouw')
+  })
+
+  it('volgt een waarde die van buitenaf gewist wordt', () => {
+    const onChange = vi.fn()
+    const { rerender } = render(<ThemeSearchField waarde="bebouw" onChange={onChange} />)
+    expect((screen.getByRole('searchbox') as HTMLInputElement).value).toBe('bebouw')
+
+    rerender(<ThemeSearchField waarde="" onChange={onChange} />)
+    expect((screen.getByRole('searchbox') as HTMLInputElement).value).toBe('')
+  })
+
+  it('houdt een toegankelijke naam', () => {
+    render(<ThemeSearchField waarde="" onChange={vi.fn()} />)
+    expect(screen.getByRole('searchbox', { name: /zoek een thema/i })).toBeTruthy()
+  })
+})

frontend/src/components/map/ThemeSearchField.tsx

@@ -0,0 +1,55 @@
+import { useEffect, useRef, useState } from 'react'
+import { Search } from 'lucide-react'
+
+interface ThemeSearchFieldProps {
+  waarde: string
+  onChange: (waarde: string) => void
+}
+
+/**
+ * Het zoekveld boven de themalijst, met zijn eigen invoertoestand.
+ *
+ * De filterwaarde zelf leeft in het viewmodel van de kaartwerkruimte, dat de
+ * hele werkruimte voedt. Rechtstreeks doorgeven betekende dat elke toetsaanslag
+ * de volledige boom hertekende, inclusief de kaart: gemeten 33 tot 58 ms per
+ * letter met lege data, en dat loopt op zodra er echt bronnen in staan.
+ *
+ * Wat de gebruiker typt blijft nu hier. Pas als het even stil is gaat de waarde
+ * naar boven. Typen voelt daardoor direct, terwijl de lijst een fractie later
+ * bijtrekt — wat bij zoeken ook het gewenste gedrag is, want filteren op elke
+ * losse letter levert toch geen bruikbaar tussenresultaat.
+ */
+const STILTE_MS = 160
+
+export function ThemeSearchField({ waarde, onChange }: ThemeSearchFieldProps): JSX.Element {
+  const [invoer, setInvoer] = useState(waarde)
+  const onChangeRef = useRef(onChange)
+  onChangeRef.current = onChange
+
+  // Wordt de waarde van buitenaf gewist (bijvoorbeeld bij een andere
+  // werkruimte), dan volgt het veld.
+  useEffect(() => {
+    setInvoer((huidig) => (huidig === waarde ? huidig : waarde))
+  }, [waarde])
+
+  useEffect(() => {
+    if (invoer === waarde) return
+    const teller = window.setTimeout(() => onChangeRef.current(invoer), STILTE_MS)
+    return () => window.clearTimeout(teller)
+    // waarde bewust niet in de lijst: die verandert door onze eigen melding.
+    // eslint-disable-next-line react-hooks/exhaustive-deps
+  }, [invoer])
+
+  return (
+    <label className="geo-theme-search">
+      <span className="sr-only">Zoek een thema of gegevensbron</span>
+      <Search aria-hidden="true" />
+      <input
+        type="search"
+        value={invoer}
+        onChange={(event) => setInvoer(event.target.value)}
+        placeholder="Zoek thema’s"
+      />
+    </label>
+  )
+}

frontend/src/components/map/mapSymbology.ts

@@ -0,0 +1,91 @@
+/**
+ * Kaartsymbologie.
+ *
+ * De kleuren van de kaartlagen stonden als losse hexwaarden door GeoMap.tsx
+ * heen. Het waren framework-standaardkleuren die bij geen enkel token uit het
+ * designsysteem hoorden, en op de donkere operationele ondergrond vielen de
+ * donkere varianten volledig weg.
+ *
+ * Deze waarden horen bij de donkere werkstand en zijn afgestemd op de tokens
+ * in geointel-system.css, sectie "Operationeel donker". Ze staan hier als
+ * letterlijke waarden omdat MapLibre paint-eigenschappen geen CSS-variabelen
+ * kunnen lezen; wijzigt een token, dan wijzigt zijn tegenhanger hier mee.
+ */
+
+export const mapSymbology = {
+  /** Officiële grenzen. Komt overeen met --gi-brand-500. */
+  boundary: '#45cfb4',
+  boundaryStrong: '#38c0a5',
+
+  /** Verandering tussen twee meetmomenten. */
+  added: '#4cc48d',
+  removed: '#ec7d76',
+  modified: '#dda45e',
+  unchanged: '#6fb0dd',
+
+  /** Eigen ingeladen data. Oranje blijft de tegenkleur van het teal-merk. */
+  dataFill: '#fb923c',
+  dataLine: '#f97316',
+
+  /** Actieve selectie. Geel leest op elke ondergrond. */
+  selectionFill: '#fde047',
+  selectionLine: '#fbbf24',
+
+  /** Water en bathymetrie. */
+  waterFill: '#38bdf8',
+  waterLine: '#7dd3fc',
+
+  /** Modelresultaten uit beeldanalyse. */
+  detectionFill: '#a78bfa',
+  detectionLine: '#c4b5fd',
+
+  /** Randen van puntsymbolen, tegen elke vulkleur. */
+  pointStroke: '#ffffff',
+
+  /** Terugvalkleur wanneer een feature geen bekende klasse heeft. */
+  fallback: '#94a3b8',
+} as const
+
+export type KaartWerkstand = 'dark' | 'light'
+
+/**
+ * De verf van de ondergrond.
+ *
+ * De tegels zijn consumentenkaarten: rode snelwegen, groene bossen,
+ * POI-drukte. In beide werkstanden worden ze ontkleurd zodat alleen de eigen
+ * data nog kleur draagt; het verschil zit in hoe ver ze gedempt worden.
+ *
+ * De featurekleuren hierboven blijven in beide werkstanden gelijk. Het zijn
+ * middentonen die op een lichte én een donkere ondergrond leesbaar zijn, en
+ * één set houdt de betekenis van een kleur constant wanneer een gebruiker
+ * tussen de twee wisselt.
+ */
+export function basemapPaint(werkstand: KaartWerkstand): Record<string, number> {
+  if (werkstand === 'light') {
+    return {
+      'raster-saturation': -0.62,
+      'raster-brightness-min': 0.32,
+      'raster-brightness-max': 1,
+      'raster-contrast': -0.14,
+      'raster-hue-rotate': 140,
+      'raster-opacity': 0.92,
+    }
+  }
+  return {
+    'raster-saturation': -0.78,
+    'raster-brightness-min': 0.03,
+    'raster-brightness-max': 0.44,
+    'raster-contrast': -0.08,
+    'raster-hue-rotate': 140,
+    'raster-opacity': 0.9,
+  }
+}
+
+export function basemapGround(werkstand: KaartWerkstand): string {
+  return werkstand === 'light' ? '#eef2f0' : '#0a100e'
+}
+
+export function huidigeWerkstand(): KaartWerkstand {
+  if (typeof document === 'undefined') return 'dark'
+  return document.body.dataset.theme === 'light' ? 'light' : 'dark'
+}

frontend/src/components/map/useMapWorkspaceViewModel.ts

@@ -328,13 +328,17 @@ export function useMapWorkspaceViewModel({
   )
   const activeTheme = DATA_THEMES.find((theme) => theme.id === activeThemeId) ?? DATA_THEMES[0]
   const activeCoverageTheme = COVERAGE_THEME_BY_MAP_THEME[activeTheme.id]
-  const activeCoverageItems = coverage?.items.filter((item) => item.theme === activeCoverageTheme) ?? []
+  // Eén normalisatie: hiervoor stond er een guard op de filter, geen op de
+  // reduce en geen op de some. Half geguard is de eigenlijke fout — het wekt
+  // zekerheid zonder die te bieden.
+  const dekkingsItems = coverage?.items ?? []
+  const activeCoverageItems = dekkingsItems.filter((item) => item.theme === activeCoverageTheme)
   const coverageCounts = useMemo(
-    () => coverage?.items.reduce<Record<CoverageStatus, number>>(
+    () => dekkingsItems.reduce<Record<CoverageStatus, number>>(
       (counts, item) => ({ ...counts, [item.status]: counts[item.status] + 1 }),
       { operational: 0, partial: 0, not_configured: 0, unsupported: 0 },
-    ) ?? { operational: 0, partial: 0, not_configured: 0, unsupported: 0 },
-    [coverage],
+    ),
+    [dekkingsItems],
   )
   const onDemandProductsForZones = useCallback((zones: string[] | null): OnDemandMapProduct[] => {
     const result: OnDemandMapProduct[] = []
@@ -534,7 +538,7 @@ export function useMapWorkspaceViewModel({
         return false
       }
       const coverageTheme = COVERAGE_THEME_BY_MAP_THEME[theme.id]
-      return coverage.items.some(
+      return dekkingsItems.some(
         (item) => item.theme === coverageTheme && item.status === 'operational',
       )
     })

frontend/src/components/models/ModelSelector.test.tsx

@@ -18,16 +18,43 @@ describe('ModelSelector', () => {
   it('opens the selector and returns an available model choice', () => {
     const onChange = vi.fn()
     render(<ModelSelector label="AI-model" value="automatic" options={options} onChange={onChange} automaticOption={{ id: 'automatic', name: 'Automatisch aanbevolen', status: 'available', tone: 'recommended' }} />)
-    fireEvent.click(screen.getByRole('button', { name: /Automatisch aanbevolen/ }))
+    const trigger = screen.getByRole('button', { name: /Automatisch aanbevolen/ })
+    expect(trigger.getAttribute('aria-expanded')).toBe('false')
+
+    fireEvent.click(trigger)
+    expect(trigger.getAttribute('aria-expanded')).toBe('true')
+    expect(trigger.getAttribute('aria-controls')).toBe(screen.getByRole('dialog').id)
+    expect(document.activeElement).toBe(screen.getByRole('radio', { name: /Automatisch aanbevolen/ }))
+
     fireEvent.click(screen.getByText('Concrete modellen'))
     fireEvent.click(screen.getByRole('radio', { name: /Snel lokaal model/ }))
     expect(onChange).toHaveBeenCalledWith('fast')
+    expect(trigger.getAttribute('aria-expanded')).toBe('false')
+    expect(document.activeElement).toBe(trigger)
   })
 
   it('keeps unavailable runtime models disabled', () => {
     render(<ModelSelector label="Analysemodel" value="fast" options={options} onChange={vi.fn()} />)
-    fireEvent.click(screen.getByRole('button', { name: /Snel lokaal model/ }))
-    fireEvent.click(screen.getByText('Concrete modellen'))
+    const trigger = screen.getByRole('button', { name: /Snel lokaal model/ })
+    fireEvent.click(trigger)
+    expect(document.activeElement).toBe(screen.getByRole('radio', { name: /Snel lokaal model/ }))
     expect((screen.getByRole('radio', { name: /Niet geconfigureerd/ }) as HTMLButtonElement).disabled).toBe(true)
   })
-})
+
+  it('closes predictably and restores trigger focus after close or cancel', () => {
+    render(<ModelSelector label="Analysemodel" value="fast" options={options} onChange={vi.fn()} />)
+    const trigger = screen.getByRole('button', { name: /Snel lokaal model/ })
+
+    fireEvent.click(trigger)
+    fireEvent.click(screen.getByRole('button', { name: 'Modelkeuze sluiten' }))
+    expect(trigger.getAttribute('aria-expanded')).toBe('false')
+    expect(document.activeElement).toBe(trigger)
+
+    fireEvent.click(trigger)
+    const dialog = screen.getByRole('dialog')
+    fireEvent(dialog, new Event('cancel', { bubbles: false, cancelable: true }))
+    expect(trigger.getAttribute('aria-expanded')).toBe('false')
+    expect(dialog.hasAttribute('open')).toBe(false)
+    expect(document.activeElement).toBe(trigger)
+  })
+})

frontend/src/components/models/ModelSelector.tsx

@@ -53,7 +53,11 @@ export function ModelSelector({
   advancedLabel = 'Concrete modellen',
 }: ModelSelectorProps): JSX.Element {
   const dialogRef = useRef<HTMLDialogElement>(null)
+  const triggerRef = useRef<HTMLButtonElement>(null)
+  const closeButtonRef = useRef<HTMLButtonElement>(null)
   const titleId = useId()
+  const dialogId = useId()
+  const [isOpen, setIsOpen] = useState(false)
   const [showAdvanced, setShowAdvanced] = useState(false)
   const allOptions = useMemo(
     () => automaticOption ? [automaticOption, ...options] : options,
@@ -64,27 +68,44 @@ export function ModelSelector({
     ?? null
 
   useEffect(() => {
-    if (!dialogRef.current?.open) return
-    const selectedButton = dialogRef.current.querySelector<HTMLElement>('[aria-checked="true"]')
-    selectedButton?.focus()
-  }, [showAdvanced])
+    if (!isOpen || !dialogRef.current?.open) return
+    const selectedButton = dialogRef.current.querySelector<HTMLButtonElement>('[role="radio"][aria-checked="true"]:not(:disabled)')
+    const firstAvailableButton = dialogRef.current.querySelector<HTMLButtonElement>('[role="radio"]:not(:disabled)')
+    ;(selectedButton ?? firstAvailableButton ?? closeButtonRef.current)?.focus()
+  }, [isOpen, showAdvanced, value])
+
+  const openDialog = () => {
+    const dialog = dialogRef.current
+    if (!dialog || dialog.open) return
+    setShowAdvanced(options.some((option) => option.id === value))
+    dialog.showModal()
+    setIsOpen(true)
+  }
+
+  const closeDialog = () => {
+    if (dialogRef.current?.open) dialogRef.current.close()
+    setIsOpen(false)
+    triggerRef.current?.focus()
+  }
 
   const select = (option: ModelSelectionOption) => {
     if (option.status !== 'available') return
     onChange(option.id)
-    dialogRef.current?.close()
+    closeDialog()
   }
 
   return (
     <div className="model-selector">
       <span className="model-selector-label">{label}</span>
       <button
+        ref={triggerRef}
         type="button"
         className="model-selector-trigger"
         aria-haspopup="dialog"
-        aria-expanded={dialogRef.current?.open ?? false}
+        aria-expanded={isOpen}
+        aria-controls={dialogId}
         disabled={disabled || loading || allOptions.length === 0}
-        onClick={() => dialogRef.current?.showModal()}
+        onClick={openDialog}
       >
         <span className="model-selector-trigger-icon"><Bot aria-hidden="true" /></span>
         <span>
@@ -94,14 +115,27 @@ export function ModelSelector({
         <ChevronDown aria-hidden="true" />
       </button>
 
-      <dialog ref={dialogRef} className="model-selector-dialog" aria-labelledby={titleId}>
+      <dialog
+        id={dialogId}
+        ref={dialogRef}
+        className="model-selector-dialog"
+        aria-labelledby={titleId}
+        onCancel={(event) => {
+          event.preventDefault()
+          closeDialog()
+        }}
+        onClose={() => {
+          setIsOpen(false)
+          triggerRef.current?.focus()
+        }}
+      >
         <div className="model-selector-dialog-header">
           <div>
             <span className="section-kicker">Taakgerichte modelkeuze</span>
             <h2 id={titleId}>Kies hoe GeoIntel analyseert</h2>
             <p>GeoIntel toont alleen modellen die door de huidige omgeving worden gerapporteerd.</p>
           </div>
-          <button type="button" className="icon-action" aria-label="Modelkeuze sluiten" onClick={() => dialogRef.current?.close()}>
+          <button ref={closeButtonRef} type="button" className="icon-action" aria-label="Modelkeuze sluiten" onClick={closeDialog}>
             <X aria-hidden="true" />
           </button>
         </div>
@@ -169,4 +203,4 @@ function ModelOptionCard({ option, checked, onSelect }: { option: ModelSelection
       ) : null}
     </div>
   )
-}
+}

frontend/src/components/models/modelOptions.test.ts

@@ -0,0 +1,44 @@
+import { describe, expect, it } from 'vitest'
+import type { DetectionModelCapability } from '../../types'
+import {
+  analysisModelAvailabilityMessage,
+  analysisModelDisplayName,
+  toAnalysisModelOption,
+} from './modelOptions'
+
+function model(overrides: Partial<DetectionModelCapability> = {}): DetectionModelCapability {
+  return {
+    model_id: 'segmentation-placeholder',
+    display_name: 'Segmentation placeholder',
+    framework: 'none',
+    task_type: 'segmentation',
+    supported_classes: [],
+    configured: false,
+    status: 'not_configured',
+    limitation_message: 'Segmentation inference is not configured for this placeholder.',
+    validated_regions: [],
+    nationally_validated: false,
+    operator_review_required: true,
+    ...overrides,
+  }
+}
+
+describe('analysis model availability copy', () => {
+  it('does not expose raw English backend placeholder copy in the Dutch UI', () => {
+    const capability = model()
+
+    expect(analysisModelAvailabilityMessage(capability)).toContain('nog geen productiegeschikt segmentatiemodel')
+    expect(analysisModelDisplayName(capability)).toBe('Segmentatiemodel nog niet geconfigureerd')
+    expect(toAnalysisModelOption(capability).description).not.toContain('Segmentation inference')
+  })
+
+  it('explains an unavailable NVIDIA runtime explicitly', () => {
+    const capability = model({
+      model_id: 'yolo-configured',
+      task_type: 'object_detection',
+      status: 'accelerator_unavailable',
+    })
+
+    expect(analysisModelAvailabilityMessage(capability)).toContain('NVIDIA CUDA')
+  })
+})

frontend/src/components/models/modelOptions.ts

@@ -1,15 +1,65 @@
 import type { DetectionModelCapability } from '../../types'
 import type { ModelSelectionOption } from './ModelSelector'
 
+export function analysisModelDisplayName(model: DetectionModelCapability): string {
+  const knownNames: Record<string, string> = {
+    'yolo-configured': 'Lokaal gebouwmodel',
+    'manual-fixture-detector': 'Testdetectie (geen productie)',
+    'yolo-placeholder': 'Gebouwmodel nog niet geconfigureerd',
+    'segmentation-placeholder': 'Segmentatiemodel nog niet geconfigureerd',
+    'fixture-segmenter': 'Testsegmentatie (geen productie)',
+    'yolo-seg-configured': 'Lokaal YOLO-segmentatiemodel',
+    'sam-configured': 'Lokaal SAM-segmentatiemodel',
+    'yolo-seg-placeholder': 'YOLO-segmentatie nog niet geconfigureerd',
+    'sam-placeholder': 'SAM-segmentatie nog niet geconfigureerd',
+  }
+  return knownNames[model.model_id] ?? model.display_name
+}
+
+function supportedClassLabel(value: string): string {
+  const labels: Record<string, string> = {
+    building: 'gebouwen',
+    vegetation: 'vegetatie',
+    water: 'water',
+    landuse: 'landgebruik',
+    segment: 'algemene vlakken',
+  }
+  return labels[value.toLowerCase()] ?? value
+}
+
+export function analysisModelAvailabilityMessage(model: DetectionModelCapability): string {
+  const task = model.task_type === 'segmentation' ? 'segmentatiemodel' : 'detectiemodel'
+  if (model.model_id === 'manual-fixture-detector' || model.model_id === 'fixture-segmenter') {
+    return 'Alleen beschikbaar voor expliciete geautomatiseerde tests; dit is geen productie-inferentie.'
+  }
+  if (model.configured) {
+    return `Dit lokale ${task} is op de server geconfigureerd. Resultaten blijven operatorcontrole vereisen.`
+  }
+  if (model.status === 'accelerator_unavailable') {
+    return 'De vereiste NVIDIA CUDA-runtime is momenteel niet beschikbaar op de server.'
+  }
+  if (model.status === 'dependency_unavailable') {
+    return 'De vereiste PyTorch- of modelsoftware is nog niet beschikbaar op de server.'
+  }
+  if (model.status === 'contract_incomplete') {
+    return 'Het modelbestand is aanwezig, maar de versieerbare provenancecontrole is nog niet volledig.'
+  }
+  if (model.model_id.includes('placeholder')) {
+    return `Er is nog geen productiegeschikt ${task} aan deze registratie gekoppeld.`
+  }
+  return `Dit ${task} is nog niet volledig geconfigureerd op de server.`
+}
+
 export function toAnalysisModelOption(model: DetectionModelCapability): ModelSelectionOption {
   const task = model.task_type === 'segmentation' ? 'segmentatie' : 'objectdetectie'
   const configured = model.configured && model.status !== 'not_configured'
+  const supportedClasses = model.supported_classes.map(supportedClassLabel)
   return {
     id: model.model_id,
-    name: model.display_name,
+    name: analysisModelDisplayName(model),
     description: configured
-      ? `Beschikbaar voor lokale ${task}${model.supported_classes.length ? ` van ${model.supported_classes.join(', ')}` : ''}.`
-      : model.limitation_message,
+      ? `Beschikbaar voor lokale ${task}${supportedClasses.length ? ` van ${supportedClasses.join(', ')}` : ''}.`
+      : analysisModelAvailabilityMessage(model),
     recommendation: model.validation_scope ? `Gevalideerd voor ${model.validation_scope}.` : undefined,
     status: configured ? 'available' : 'unavailable',
     statusLabel: configured ? 'Beschikbaar' : 'Niet geconfigureerd',
@@ -24,4 +74,4 @@ export function toAnalysisModelOption(model: DetectionModelCapability): ModelSel
       model.operator_review_required ? 'Operatorcontrole vereist' : '',
     ].filter(Boolean),
   }
-}
+}

frontend/src/components/providers/ProviderPanel.test.tsx

@@ -0,0 +1,41 @@
+import { cleanup, render, screen } from '@testing-library/react'
+import { afterEach, describe, expect, it, vi } from 'vitest'
+import { ProviderPanel } from './ProviderPanel'
+import type { ProviderCapability } from '../../types'
+
+function props(overschrijf: Partial<Parameters<typeof ProviderPanel>[0]> = {}) {
+  return {
+    selectedProjectId: 'p-1',
+    providers: [] as ProviderCapability[],
+    loadingCapabilities: false,
+    capabilitiesError: null,
+    onRefresh: vi.fn(),
+    onOpenSources: vi.fn(),
+    onOpenStatus: vi.fn(),
+    onOpenMap: vi.fn(),
+    ...overschrijf,
+  }
+}
+
+describe('ProviderPanel', () => {
+  afterEach(() => cleanup())
+
+  it('blijft overeind bij een antwoord dat zijn eigen contract schendt', () => {
+    // Het type zegt dat providers altijd meekomt. Dit paneel gebruikte die
+    // lijst op drie plekken en had er op één een guard; nu wordt hij aan de
+    // kop genormaliseerd. Een type is een belofte van de compiler, niet van
+    // het netwerk.
+    const zonder = props({ providers: undefined as unknown as ProviderCapability[] })
+    expect(() => render(<ProviderPanel {...zonder} />)).not.toThrow()
+  })
+
+  it('toont een lege toestand zonder koppelingen', () => {
+    render(<ProviderPanel {...props()} />)
+    expect(screen.getByText(/geen databronnen gemeld/i)).toBeTruthy()
+  })
+
+  it('meldt het wanneer de status niet opgehaald kon worden', () => {
+    render(<ProviderPanel {...props({ capabilitiesError: 'Bronservice niet bereikbaar' })} />)
+    expect(screen.getByText(/bronservice niet bereikbaar/i)).toBeTruthy()
+  })
+})

frontend/src/components/providers/ProviderPanel.tsx

@@ -52,7 +52,10 @@ export function ProviderPanel({
   onOpenStatus,
   onOpenMap,
 }: ProviderPanelProps): JSX.Element {
-  const configuredCount = providers.filter((provider) => provider.configured).length
+  // Eén normalisatie aan de kop, in plaats van op elke gebruiksplek een guard.
+  // Een antwoord zonder deze lijst liet het paneel eerder vallen.
+  const koppelingen = providers ?? []
+  const configuredCount = koppelingen.filter((provider) => provider.configured).length
   const [operations, setOperations] = useState<AoiOperation[]>([])
   const [operationsError, setOperationsError] = useState<string | null>(null)
   const [loadingOperations, setLoadingOperations] = useState(false)
@@ -93,7 +96,7 @@ export function ProviderPanel({
         </div>
 
         <div className="system-command-surface" aria-label="Systeemacties">
-          <div><span>Bronkoppelingen</span><strong>{configuredCount} van {providers.length} actief</strong></div>
+          <div><span>Bronkoppelingen</span><strong>{configuredCount} van {koppelingen.length} actief</strong></div>
           <div><span>Werkmodus</span><strong>Begrensde bronopvraging</strong></div>
           <div className="system-command-actions">
             <button type="button" className="primary-action" onClick={onOpenMap}>Open operationele kaart</button>
@@ -115,7 +118,7 @@ export function ProviderPanel({
               <p>{capabilitiesError}</p>
             </div>
           ) : null}
-          {providers.length === 0 && !loadingCapabilities ? (
+          {koppelingen.length === 0 && !loadingCapabilities ? (
             <div className="result-state result-state-empty">
               <strong>Geen databronnen gemeld.</strong>
               <p>Vernieuw de status zodra de backend bereikbaar is.</p>
@@ -157,7 +160,7 @@ export function ProviderPanel({
             </div>
           </div>
           <ul className="system-provider-list">
-            {providers.map((provider) => (
+            {koppelingen.map((provider) => (
               <li className="system-provider-card" key={provider.provider_name}>
                 <div className="system-provider-header">
                   <div>

frontend/src/components/quality/DetectionReviewPanel.tsx

@@ -197,7 +197,7 @@ export function DetectionReviewPanel({
       ) : null}
 
       <ol className="detection-review-list">
-        {queue?.items.map((item) => {
+        {queue?.items?.map((item) => {
           const key = reviewKey(item)
           const decision = draftDecisions[key] ?? item.decision
           return (

frontend/src/components/quality/QualityResultsPanel.tsx

@@ -80,7 +80,7 @@ function qualityCheckTypeLabel(checkType: string | null | undefined): string {
 }
 
 function metricByKey(check: QualityCheckRead | null, metricKey: string): MetricRead | undefined {
-  return check?.metrics.find((metric) => metric.metric_key === metricKey)
+  return check?.metrics?.find((metric) => metric.metric_key === metricKey)
 }
 
 function findingEvidenceList(check: QualityCheckRead | null, key: string): Record<string, unknown>[] {

frontend/src/components/segmentation/SegmentationLab.tsx

@@ -1,5 +1,6 @@
 import type {
   DatasetCreateResponse,
+  JobRead,
   SegmentationModelCapability,
   SegmentationQaResult,
   SegmentationRead,
@@ -7,7 +8,11 @@ import type {
   SegmentationRunResponse,
 } from '../../types'
 import { ModelSelector } from '../models/ModelSelector'
-import { toAnalysisModelOption } from '../models/modelOptions'
+import {
+  analysisModelAvailabilityMessage,
+  analysisModelDisplayName,
+  toAnalysisModelOption,
+} from '../models/modelOptions'
 
 interface SegmentationLabProps {
   segmentationModels: SegmentationModelCapability[]
@@ -18,11 +23,14 @@ interface SegmentationLabProps {
   segmentationTileManifestPath: string
   segmentationConfidenceThreshold: number
   runningSegmentation: boolean
+  segmentationJob: JobRead | null
   segmentationRunResult: SegmentationRunResponse | null
   segmentationRunError: string | null
   segmentationRuns: SegmentationRunRead[]
   selectedSegmentationRunId: string
   segmentationItems: SegmentationRead[]
+  segmentationTotal: number
+  segmentationTruncated: boolean
   segmentationClassFilter: string
   segmentationMinConfidenceFilter: number
   loadingSegmentationResults: boolean
@@ -92,11 +100,14 @@ export function SegmentationLab({
   segmentationTileManifestPath,
   segmentationConfidenceThreshold,
   runningSegmentation,
+  segmentationJob,
   segmentationRunResult,
   segmentationRunError,
   segmentationRuns,
   selectedSegmentationRunId,
   segmentationItems,
+  segmentationTotal,
+  segmentationTruncated,
   segmentationClassFilter,
   segmentationMinConfidenceFilter,
   loadingSegmentationResults,
@@ -127,8 +138,15 @@ export function SegmentationLab({
   const segmentationHasTileManifest = segmentationTileManifestPath.trim().length > 0
   const segmentationModelUiRunnable =
     selectedSegmentationModelConfigured && selectedSegmentationModelId !== 'fixture-segmenter'
+  const selectedSegmentationModel = segmentationModels.find(
+    (model) => model.model_id === selectedSegmentationModelId,
+  ) ?? null
+  const selectedSegmentationModelAvailability = selectedSegmentationModel
+    ? analysisModelAvailabilityMessage(selectedSegmentationModel)
+    : selectedSegmentationModelLimitation ?? 'Het gekozen segmentatiemodel is niet geconfigureerd'
   const segmentationRunReady =
-    Boolean(selectedProjectId) && segmentationHasDataset && segmentationModelUiRunnable
+    Boolean(selectedProjectId) && segmentationHasDataset && segmentationModelUiRunnable && segmentationHasTileManifest
+  const segmentationJobActive = segmentationJob?.status === 'queued' || segmentationJob?.status === 'running'
   const segmentationRunBlockedReason = !selectedProjectId
     ? 'Kies eerst een werkruimte'
     : !segmentationHasDataset
@@ -136,8 +154,10 @@ export function SegmentationLab({
       : selectedSegmentationModelId === 'fixture-segmenter'
         ? 'Het fixturemodel is alleen bedoeld voor expliciete tests en demo’s'
         : !selectedSegmentationModelConfigured
-          ? selectedSegmentationModelLimitation ?? 'Het gekozen segmentatiemodel is niet geconfigureerd'
-          : null
+          ? selectedSegmentationModelAvailability
+          : !segmentationHasTileManifest
+            ? 'Koppel eerst het beeldtegelmanifest van het gekozen rasterbestand'
+            : null
 
   return (
     <section className="workspace-panel ai-lab-shell segmentation-lab-shell">
@@ -180,10 +200,10 @@ export function SegmentationLab({
         <ul className="model-list">
           {segmentationModels.map((model) => (
             <li className={model.configured ? 'model-card model-card-ready' : 'model-card'} key={model.model_id}>
-              <strong>{model.display_name}</strong>
+              <strong>{analysisModelDisplayName(model)}</strong>
               <span className={model.configured ? 'status-badge status-badge-ready' : 'status-badge'}>{model.configured ? 'gereed' : 'niet geconfigureerd'}</span>
               <p className="muted">Ondersteunde klassen: {model.supported_classes.join(', ') || 'niet opgegeven'}</p>
-              <p className="muted">{model.limitation_message}</p>
+              <p className="muted">{analysisModelAvailabilityMessage(model)}</p>
               <details className="technical-inline-details">
                 <summary>Technische identificatie</summary>
                 <div className="entity-meta">
@@ -219,17 +239,19 @@ export function SegmentationLab({
                 <span>Rasterbestand</span>
                 <strong>{segmentationHasDataset ? 'Geselecteerd' : 'Kies een rasterbestand'}</strong>
               </div>
-              <div className={selectedSegmentationModelConfigured ? 'lab-readiness-item lab-readiness-item-ready' : 'lab-readiness-item'}>
+              <div className={segmentationModelUiRunnable ? 'lab-readiness-item lab-readiness-item-ready' : 'lab-readiness-item'}>
                 <span>Analysemodel</span>
                 <strong>
-                  {selectedSegmentationModelConfigured
+                  {selectedSegmentationModelId === 'fixture-segmenter'
+                    ? 'Alleen beschikbaar voor geautomatiseerde tests'
+                    : selectedSegmentationModelConfigured
                     ? 'Het gekozen model is beschikbaar'
-                    : selectedSegmentationModelLimitation ?? 'Kies een geconfigureerd segmentatiemodel'}
+                    : selectedSegmentationModelAvailability}
                 </strong>
               </div>
               <div className={segmentationHasTileManifest ? 'lab-readiness-item lab-readiness-item-ready' : 'lab-readiness-item'}>
                 <span>Beeldtegels</span>
-                <strong>{segmentationHasTileManifest ? 'Technisch manifest gekoppeld' : 'Niet vereist voor het fixturemodel'}</strong>
+                <strong>{segmentationHasTileManifest ? 'Technisch manifest gekoppeld' : 'Koppel het tegelmanifest van het rasterbestand'}</strong>
               </div>
             </div>
           </div>
@@ -292,29 +314,44 @@ export function SegmentationLab({
             className="primary-action"
             type="button"
             onClick={onRunSegmentation}
-            disabled={runningSegmentation || !segmentationRunReady}
+            disabled={runningSegmentation || segmentationJobActive || !segmentationRunReady}
           >
-            Segmentatie starten
+            {segmentationJob?.status === 'queued'
+              ? 'Wachten op NVIDIA GPU…'
+              : runningSegmentation
+                ? 'GPU-segmentatie wordt verwerkt…'
+                : 'Segmentatie starten'}
           </button>
         </div>
       </div>
 
       <div className="ai-lab-state-stack">
+        {segmentationJobActive ? (
+          <div className="result-state result-state-loading" role="status" aria-live="polite">
+            <strong>{segmentationJob?.status === 'queued' ? 'GPU-taak staat in de wachtrij.' : 'GPU-segmentatie wordt uitgevoerd.'}</strong>
+            <p>
+              {segmentationJob?.status === 'queued'
+                ? 'De server start de taak zodra de NVIDIA-worker beschikbaar is.'
+                : 'GeoIntel volgt de servertaak en toont na voltooiing alleen de werkelijk bewaarde polygonen.'}
+            </p>
+            <span className="muted">Taak-ID: {segmentationJob?.id}</span>
+          </div>
+        ) : null}
         {!selectedSegmentationModelConfigured ? (
           <div className="result-state result-state-empty">
             <strong>Het segmentatiemodel is nog niet gereed.</strong>
-            <p>{selectedSegmentationModelLimitation ?? 'Kies een geconfigureerd segmentatiemodel.'}</p>
+            <p>{selectedSegmentationModelAvailability}</p>
           </div>
         ) : null}
         {segmentationRunError ? (
-          <div className="result-state result-state-error">
+          <div className="result-state result-state-error" role="alert">
             <strong>De segmentatie is mislukt.</strong>
             <p>{segmentationRunError}</p>
           </div>
         ) : null}
         {segmentationRunResult ? (
-          <div className="result-summary-card">
-            <p>Status: {segmentationRunResult.status === 'completed' ? 'afgerond' : segmentationRunResult.status}</p>
+          <div className={segmentationRunResult.segmentation_count === 0 ? 'result-state result-state-warning' : 'result-summary-card'} role="status">
+            <p>Status: {analysisStatusLabel(segmentationRunResult.status)}</p>
             <p>{segmentationRunResult.message}</p>
             <p>Herkende vlakken: {segmentationRunResult.segmentation_count}</p>
             {segmentationRunResult.error_code ? <p className="error">Code: {segmentationRunResult.error_code}</p> : null}
@@ -382,10 +419,30 @@ export function SegmentationLab({
           </div>
         ) : null}
         <div className="ai-lab-state-stack">
-          <div className="result-state result-state-ready">
-            <strong>{segmentationItems.length} vlakken geladen</strong>
-            <p>{selectedSegmentationRunId ? 'Deze resultaten zijn bewaard in de database.' : 'Kies eerst een bewaarde analyse.'}</p>
-          </div>
+          {loadingSegmentationResults || segmentationRunError ? null : !selectedSegmentationRunId ? (
+            <div className="result-state result-state-empty">
+              <strong>Kies eerst een bewaarde analyse.</strong>
+              <p>Daarna toont GeoIntel uitsluitend de polygonen van die analyserun.</p>
+            </div>
+          ) : segmentationTotal === 0 ? (
+            <div className="result-state result-state-empty">
+              <strong>Geen bewaarde vlakken binnen deze filters.</strong>
+              <p>Dit bewijst niet dat het gebied geen relevante objecten bevat.</p>
+            </div>
+          ) : (
+            <div className={segmentationTruncated ? 'result-state result-state-warning' : 'result-state result-state-ready'}>
+              <strong>
+                {segmentationTruncated
+                  ? `${segmentationItems.length} van ${segmentationTotal} vlakken geladen`
+                  : `${segmentationTotal} vlakken geladen`}
+              </strong>
+              <p>
+                {segmentationTruncated
+                  ? 'De kaart en tabel tonen een begrensde pagina. Gebruik filters om het resultaat gericht te verfijnen.'
+                  : 'Deze resultaten zijn bewaard in de database.'}
+              </p>
+            </div>
+          )}
         </div>
         {segmentationItems.length > 0 ? (
           <div className="table-scroll">

frontend/src/components/shell/SecondaryDisplay.tsx

@@ -18,14 +18,100 @@ function defaultGeometry(): SecondaryDisplayGeometry {
   }
 }
 
+/**
+ * Neemt de opmaak van het hoofdvenster mee naar de console.
+ *
+ * De vorige versie kloonde de <link rel="stylesheet"> naar het nieuwe venster.
+ * Dat venster wordt geopend met window.open('') en is dus about:blank; daar
+ * werd de link wel in de head gezet maar nooit opgehaald — nagemeten leverde
+ * link.sheet === null op. Gevolg: de console stond volledig onopgemaakt, in
+ * Times New Roman op wit, terwijl de werkbank ernaast donker was. Het verklaart
+ * ook waarom de paneelregels voor dit venster met !important stonden: die
+ * probeerden iets te overschrijven dat er nooit aankwam. Sinds de opmaak hier
+ * wel aankomt zijn ze overbodig gebleken en verwijderd.
+ *
+ * Nu worden de regels zelf ingeschreven. Dat is dezelfde oorsprong, dus
+ * cssRules is leesbaar, en er komt geen netwerkverzoek aan te pas. Lukt het
+ * lezen toch niet, dan valt hij terug op de gekloonde link.
+ */
 function copyDocumentStyles(target: Document): void {
+  const regels: string[] = []
+  let alleenGelezen = true
+
+  // Verwijzingen in de regels — lettertypen, iconen, achtergronden — staan
+  // relatief. Het nieuwe venster is about:blank en heeft dus geen basis om ze
+  // tegen op te lossen; zonder deze stap blijft het wachten op lettertypen die
+  // nooit aankomen. Ze worden hier absoluut gemaakt tegen de bron van het blad.
+  const maakAbsoluut = (tekst: string, basis: string): string =>
+    tekst.replace(/url\((['"]?)([^'")]+)\1\)/g, (heel, quote, verwijzing) => {
+      if (/^(data:|blob:|https?:|\/\/)/i.test(verwijzing)) return heel
+      try {
+        return `url("${new URL(verwijzing, basis).href}")`
+      } catch {
+        return heel
+      }
+    })
+
+  // @font-face gaat bewust niet mee. De bestanden komen in dit venster wel
+  // binnen met status 200, maar de FontFace springt nooit naar 'loaded': in een
+  // document dat op about:blank staat voltooit het lettertypeladen niet. Het
+  // gevolg was dat document.fonts.status eeuwig op 'loading' bleef en de console
+  // kort in terugvalletters opende. De gezichten worden in plaats daarvan
+  // overgenomen uit het hoofdvenster, waar ze al geladen zijn — zie
+  // copyLoadedFonts hieronder.
+  const isFontFace = (regel: CSSRule): boolean =>
+    typeof CSSFontFaceRule !== 'undefined' && regel instanceof CSSFontFaceRule
+
+  for (const sheet of Array.from(document.styleSheets)) {
+    try {
+      const basis = sheet.href ?? document.baseURI
+      const tekst = Array.from(sheet.cssRules)
+        .filter((regel) => !isFontFace(regel))
+        .map((regel) => maakAbsoluut(regel.cssText, basis))
+        .join('\n')
+      if (tekst) regels.push(tekst)
+    } catch {
+      alleenGelezen = false
+    }
+  }
+
+  if (regels.length > 0) {
+    const stijl = target.createElement('style')
+    stijl.setAttribute('data-herkomst', 'hoofdvenster')
+    stijl.textContent = regels.join('\n')
+    target.head.append(stijl)
+  }
+
+  if (alleenGelezen && regels.length > 0) return
+
+  // Terugval voor bladen die niet te lezen zijn, bijvoorbeeld van een ander domein.
   document.head.querySelectorAll<HTMLLinkElement | HTMLStyleElement>('link[rel="stylesheet"], style').forEach((node) => {
     const clone = node.cloneNode(true) as HTMLLinkElement | HTMLStyleElement
-    if (clone instanceof HTMLLinkElement) clone.href = node instanceof HTMLLinkElement ? node.href : ''
+    if (clone instanceof HTMLLinkElement && node instanceof HTMLLinkElement) clone.href = node.href
     target.head.append(clone)
   })
 }
 
+/**
+ * Neemt de al geladen lettertypegezichten van het hoofdvenster over.
+ *
+ * Een FontFace hangt niet aan een document, dus een gezicht dat hier al
+ * ingeladen is kan rechtstreeks aan de FontFaceSet van het nieuwe venster
+ * worden toegevoegd. Dat scheelt niet alleen een tweede download, het omzeilt
+ * ook dat het laden in een about:blank-document nooit voltooit.
+ */
+function copyLoadedFonts(target: Window): void {
+  const doel = target.document.fonts
+  if (!doel || typeof document.fonts === 'undefined') return
+  document.fonts.forEach((gezicht) => {
+    try {
+      doel.add(gezicht)
+    } catch {
+      // Al aanwezig, of dit gezicht laat zich niet overdragen.
+    }
+  })
+}
+
 function initialiseSecondaryDocument(target: Window, onClose: () => void): HTMLElement {
   const targetDocument = target.document
   targetDocument.title = 'GeoIntel · Analyseconsole'
@@ -37,6 +123,7 @@ function initialiseSecondaryDocument(target: Window, onClose: () => void): HTMLE
   viewport.content = 'width=device-width, initial-scale=1'
   targetDocument.head.append(viewport)
   copyDocumentStyles(targetDocument)
+  copyLoadedFonts(target)
 
   const shell = targetDocument.createElement('div')
   shell.className = 'secondary-display-shell'

frontend/src/components/shell/WorkbenchNavigation.tsx

@@ -11,11 +11,11 @@ import {
 } from 'lucide-react'
 import type { WorkspaceKey } from '../overview/OverviewWorkspace'
 import { GeoIntelMark } from '../brand/GeoIntelBrand'
-import { ItWorxSignature } from '../brand/ItWorxSignature'
 
 export interface WorkspaceNavigationItem {
   key: WorkspaceKey
   label: string
+  navigationLabel?: string
   description: string
 }
 
@@ -79,14 +79,13 @@ export function WorkbenchNavigation({
                   data-testid={`workspace-nav-${item.key}`}
                 >
                   <Icon className="nav-item-icon" aria-hidden="true" strokeWidth={1.8} />
-                  <span>{item.label}</span>
+                  <span>{item.navigationLabel ?? item.label}</span>
                 </button>
               )
             })}
           </div>
         ))}
       </nav>
-      <ItWorxSignature />
     </aside>
   )
 }

frontend/src/components/shell/WorkspaceErrorBoundary.test.tsx

@@ -0,0 +1,68 @@
+import { useState } from 'react'
+import { cleanup, fireEvent, render, screen } from '@testing-library/react'
+import { afterEach, describe, expect, it, vi } from 'vitest'
+import { WorkspaceErrorBoundary } from './WorkspaceErrorBoundary'
+
+function Struikelt({ gooi }: { gooi: boolean }): JSX.Element {
+  if (gooi) {
+    throw new Error('checks is undefined')
+  }
+  return <p>werkblad staat</p>
+}
+
+describe('WorkspaceErrorBoundary', () => {
+  afterEach(() => cleanup())
+
+  it('houdt de schil overeind en biedt een nieuwe poging aan', () => {
+    // React logt de gevangen fout zelf ook; die ruis hoort niet in de uitvoer.
+    const stil = vi.spyOn(console, 'error').mockImplementation(() => {})
+
+    function Proef(): JSX.Element {
+      const [gooi, setGooi] = useState(true)
+      return (
+        <div>
+          <button type="button" onClick={() => setGooi(false)}>herstel de bron</button>
+          <WorkspaceErrorBoundary resetKey="ai" label="Beeldanalyse">
+            <Struikelt gooi={gooi} />
+          </WorkspaceErrorBoundary>
+        </div>
+      )
+    }
+
+    render(<Proef />)
+
+    // De fout is opgevangen: de melding staat er, de schil eromheen ook.
+    expect(screen.getByTestId('workspace-error')).toBeTruthy()
+    expect(screen.getByText('Beeldanalyse kon niet worden getoond')).toBeTruthy()
+    expect(screen.getByText('checks is undefined')).toBeTruthy()
+    expect(screen.getByRole('button', { name: /herstel de bron/i })).toBeTruthy()
+
+    // Na herstel van de oorzaak brengt "Opnieuw proberen" het werkblad terug.
+    fireEvent.click(screen.getByRole('button', { name: /herstel de bron/i }))
+    fireEvent.click(screen.getByRole('button', { name: /opnieuw proberen/i }))
+    expect(screen.getByText('werkblad staat')).toBeTruthy()
+
+    stil.mockRestore()
+  })
+
+  it('wist de fout zodra de gebruiker naar een ander werkblad gaat', () => {
+    const stil = vi.spyOn(console, 'error').mockImplementation(() => {})
+
+    const { rerender } = render(
+      <WorkspaceErrorBoundary resetKey="ai" label="Beeldanalyse">
+        <Struikelt gooi />
+      </WorkspaceErrorBoundary>,
+    )
+    expect(screen.getByTestId('workspace-error')).toBeTruthy()
+
+    rerender(
+      <WorkspaceErrorBoundary resetKey="map" label="Kaart">
+        <Struikelt gooi={false} />
+      </WorkspaceErrorBoundary>,
+    )
+    expect(screen.getByText('werkblad staat')).toBeTruthy()
+    expect(screen.queryByTestId('workspace-error')).toBeNull()
+
+    stil.mockRestore()
+  })
+})

frontend/src/components/shell/WorkspaceErrorBoundary.tsx

@@ -0,0 +1,83 @@
+import { Component, type ErrorInfo, type ReactNode } from 'react'
+import { CircleAlert, RotateCcw } from 'lucide-react'
+
+interface WorkspaceErrorBoundaryProps {
+  /** Verandert deze sleutel, dan probeert de grens het opnieuw. Zet hier de
+      actieve werkruimte in, zodat wegnavigeren de fout wist. */
+  resetKey: string
+  /** Naam van het werkblad, voor de melding. */
+  label: string
+  children: ReactNode
+}
+
+interface WorkspaceErrorBoundaryState {
+  error: Error | null
+  resetKey: string
+}
+
+/**
+ * Vangt een fout in één werkblad op.
+ *
+ * Zonder deze grens nam een enkele component die gooit de hele werkbank mee:
+ * React ontkoppelt dan de volledige boom en de operator houdt een leeg scherm
+ * over, inclusief de kaart en de navigatie. Dat is voor een operationeel
+ * gereedschap de verkeerde verhouding tussen oorzaak en gevolg.
+ *
+ * Nu blijft de schil staan. De gebruiker ziet welk werkblad het liet afweten,
+ * kan naar een ander werkblad, en kan dit werkblad opnieuw proberen.
+ */
+export class WorkspaceErrorBoundary extends Component<WorkspaceErrorBoundaryProps, WorkspaceErrorBoundaryState> {
+  constructor(props: WorkspaceErrorBoundaryProps) {
+    super(props)
+    this.state = { error: null, resetKey: props.resetKey }
+  }
+
+  static getDerivedStateFromError(error: Error): Partial<WorkspaceErrorBoundaryState> {
+    return { error }
+  }
+
+  static getDerivedStateFromProps(
+    props: WorkspaceErrorBoundaryProps,
+    state: WorkspaceErrorBoundaryState,
+  ): Partial<WorkspaceErrorBoundaryState> | null {
+    if (props.resetKey !== state.resetKey) {
+      return { error: null, resetKey: props.resetKey }
+    }
+    return null
+  }
+
+  componentDidCatch(error: Error, info: ErrorInfo): void {
+    // De stack blijft in de console beschikbaar voor wie meekijkt; er gaat
+    // niets naar buiten.
+    console.error(`Werkblad "${this.props.label}" is gestopt:`, error, info.componentStack)
+  }
+
+  private retry = (): void => {
+    this.setState({ error: null })
+  }
+
+  render(): ReactNode {
+    const { error } = this.state
+    if (!error) {
+      return this.props.children
+    }
+
+    return (
+      <section className="workspace-error" role="alert" data-testid="workspace-error">
+        <CircleAlert aria-hidden="true" />
+        <div>
+          <strong>{this.props.label} kon niet worden getoond</strong>
+          <p>
+            De rest van de werkbank blijft bruikbaar. Ga naar een ander werkblad, of probeer dit werkblad
+            opnieuw te openen.
+          </p>
+          <p className="workspace-error-detail">{error.message}</p>
+        </div>
+        <button type="button" className="secondary-action" onClick={this.retry}>
+          <RotateCcw aria-hidden="true" />
+          <span>Opnieuw proberen</span>
+        </button>
+      </section>
+    )
+  }
+}

frontend/src/components/status/SourceFreshnessPanel.test.tsx

@@ -0,0 +1,59 @@
+import { cleanup, render, screen } from '@testing-library/react'
+import { afterEach, describe, expect, it, vi } from 'vitest'
+import { SourceFreshnessPanel } from './SourceFreshnessPanel'
+import type { SourceFreshnessReport } from '../../types'
+
+function props(overschrijf: Partial<Parameters<typeof SourceFreshnessPanel>[0]> = {}) {
+  return {
+    report: null,
+    loading: false,
+    error: null,
+    onRefresh: vi.fn(),
+    catalogReport: null,
+    catalogLoading: false,
+    catalogError: null,
+    onProbeCatalogs: vi.fn(),
+    grbRefreshPlan: null,
+    grbRefreshPlanLoading: false,
+    grbRefreshPlanError: null,
+    ...overschrijf,
+  }
+}
+
+const leegRapport: SourceFreshnessReport = {
+  project_id: 'p-1',
+  generated_at: '2026-08-23T09:00:00Z',
+  summary: {
+    source_count: 0,
+    dataset_count: 0,
+    current_count: 0,
+    due_count: 0,
+    review_required_count: 0,
+    local_count: 0,
+    sources_with_integrity_issues: 0,
+    integrity_issue_count: 0,
+  },
+  items: [],
+  limitations: [],
+}
+
+describe('SourceFreshnessPanel', () => {
+  afterEach(() => cleanup())
+
+  it('blijft overeind bij een antwoord dat zijn eigen contract schendt', () => {
+    // Het type zegt dat items altijd meekomt, maar een type is een belofte van
+    // de compiler en geen garantie van het netwerk. Vandaar de optionele keten
+    // in de component; deze test legt vast dat die er blijft.
+    const zonderItems = { ...leegRapport, items: undefined } as unknown as SourceFreshnessReport
+    expect(() => render(<SourceFreshnessPanel {...props({ report: zonderItems })} />)).not.toThrow()
+  })
+
+  it('toont een leeg rapport zonder te struikelen', () => {
+    expect(() => render(<SourceFreshnessPanel {...props({ report: leegRapport })} />)).not.toThrow()
+  })
+
+  it('meldt een fout in plaats van hem te verzwijgen', () => {
+    render(<SourceFreshnessPanel {...props({ error: 'Kon de brondekking niet ophalen' })} />)
+    expect(screen.getByText(/kon de brondekking niet ophalen/i)).toBeTruthy()
+  })
+})

frontend/src/components/status/SourceFreshnessPanel.tsx

@@ -142,7 +142,10 @@ export function SourceFreshnessPanel({
   grbRefreshPlanLoading,
   grbRefreshPlanError,
 }: SourceFreshnessPanelProps): JSX.Element {
-  const attentionItems = report?.items.filter((item) => item.status === 'due' || item.status === 'review_required') ?? []
+  // Eén normalisatie aan de kop in plaats van een guard per gebruiksplek; de
+  // vorige versie had er één op de filter en geen op de map.
+  const bronnen = report?.items ?? []
+  const attentionItems = bronnen.filter((item) => item.status === 'due' || item.status === 'review_required')
   const summary = report?.summary
 
   return (
@@ -191,7 +194,7 @@ export function SourceFreshnessPanel({
               <strong>gecontroleerd {formatDate(report.generated_at)}</strong>
             </summary>
             <div className="source-freshness-list">
-              {report.items.map((item) => <SourceRow item={item} key={item.source_name} />)}
+              {bronnen.map((item) => <SourceRow item={item} key={item.source_name} />)}
             </div>
             <p className="source-freshness-limitation">{report.limitations.join(' ')}</p>
           </details>

frontend/src/hooks/useChangeDetectionWorkflow.ts

@@ -38,7 +38,7 @@ export function useChangeDetectionWorkflow({
     const targetDatasetId =
       changeTargetDatasetId || availableVectorDatasets.find((dataset) => dataset.id !== sourceDatasetId)?.id
     if (!sourceDatasetId || !targetDatasetId) {
-      setChangeDetectionError('Select two vector datasets')
+      setChangeDetectionError('Kies twee vectorbronnen')
       return
     }
     if (sourceDatasetId === targetDatasetId) {

frontend/src/hooks/useCoverageResolver.test.tsx

@@ -85,6 +85,28 @@ describe('useCoverageResolver', () => {
     expect(result.current.coverageDurationMs).toBeNull()
   })
 
+  it('clears stale coverage as soon as a different selection starts resolving', async () => {
+    const nextBbox = { ...bbox, min_x: 5.1, max_x: 5.2 }
+    const { result, rerender } = renderHook(
+      ({ selection }) => useCoverageResolver({ projectId: 'project-1', bbox: selection }),
+      { initialProps: { selection: bbox } },
+    )
+
+    await act(async () => {
+      await vi.advanceTimersByTimeAsync(250)
+    })
+    expect(result.current.coverage).toEqual(coverageResult)
+
+    rerender({ selection: nextBbox })
+
+    expect(result.current.coverage).toBeNull()
+    expect(result.current.loadingCoverage).toBe(true)
+    await act(async () => {
+      await vi.advanceTimersByTimeAsync(249)
+    })
+    expect(mocks.resolveCoverage).toHaveBeenCalledTimes(1)
+  })
+
   it('exposes provider failures without retaining stale results', async () => {
     mocks.resolveCoverage.mockRejectedValueOnce(new Error('provider unavailable'))
     const { result } = renderHook(() => useCoverageResolver({ projectId: 'project-1', bbox }))

frontend/src/hooks/useCoverageResolver.ts

@@ -26,11 +26,14 @@ export function useCoverageResolver({ projectId, bbox }: CoverageResolverOptions
       return
     }
     let cancelled = false
+    // A new AOI must never temporarily display the previous AOI's coverage.
+    // Clear immediately; the debounce only postpones the network request.
+    setCoverage(null)
+    setCoverageError(null)
+    setLoadingCoverage(true)
+    setCoverageDurationMs(null)
     const timer = window.setTimeout(() => {
       const startedAt = Date.now()
-      setLoadingCoverage(true)
-      setCoverageError(null)
-      setCoverageDurationMs(null)
       externalApi.resolveCoverage({
         projectId,
         bbox: {

frontend/src/hooks/useDatasetWorkflow.ts

@@ -82,6 +82,13 @@ export function useDatasetWorkflow({
   setErrorMessage,
   isVectorDatasetType,
 }: DatasetWorkflowOptions) {
+  // De detailgegevens van een bron werden bij een fout stilzwijgend
+  // overgeslagen; het paneel bleef dan leeg zonder dat iemand wist waarom.
+  const meldDetailFout = (fout: unknown) => {
+    setErrorMessage(fout instanceof Error ? fout.message : 'De brondetails konden niet worden geladen')
+    return null
+  }
+
   const [selectedDatasetId, setSelectedDatasetId] = useState<string | null>(null)
   const [selectedDataset, setSelectedDataset] = useState<DatasetCreateResponse | null>(null)
   const [selectedDatasetSummary, setSelectedDatasetSummary] = useState<VectorSummary | null>(null)
@@ -145,7 +152,7 @@ export function useDatasetWorkflow({
       datasets.find((dataset) => dataset.status === 'ready') ??
       datasets[0]
     if (defaultDataset) {
-      loadDatasetDetails(selectedProjectId, defaultDataset).catch(() => null)
+      loadDatasetDetails(selectedProjectId, defaultDataset).catch(meldDetailFout)
     }
   }, [datasets, isVectorDatasetType, selectedDatasetId, selectedProjectId])
 
@@ -223,15 +230,15 @@ export function useDatasetWorkflow({
   const uploadDataset = async (event: FormEvent) => {
     event.preventDefault()
     if (!selectedProjectId || !datasetForm.file) {
-      setErrorMessage('Select project and upload a file')
+      setErrorMessage('Kies een werkruimte en voeg een bestand toe')
       return
     }
     if (!datasetForm.datasetRole) {
-      setErrorMessage('Select dataset role')
+      setErrorMessage('Kies de rol van deze bron')
       return
     }
     if (datasetForm.datasetRole === 'reference' && datasetForm.datasetType !== 'vector' && datasetForm.datasetType !== 'geojson') {
-      setErrorMessage('Reference role requires vector dataset upload')
+      setErrorMessage('Een referentierol vraagt om een vectorbestand')
       return
     }
     if (datasetForm.sourceMetadataJson) {
@@ -273,7 +280,7 @@ export function useDatasetWorkflow({
       setDatasetForm((previous) => ({ ...previous, file: null }))
       await loadProjectData(selectedProjectId)
     } catch (error) {
-      setErrorMessage(error instanceof Error ? error.message : 'Failed to upload dataset')
+      setErrorMessage(error instanceof Error ? error.message : 'De bron kon niet worden ingeladen')
     }
   }
 
@@ -284,7 +291,7 @@ export function useDatasetWorkflow({
     await Promise.all([loadDatasetJobs(selectedProjectId, selectedDatasetId), loadProjectData(selectedProjectId)])
     const refreshed = datasets.find((dataset) => dataset.id === selectedDatasetId)
     if (refreshed) {
-      loadDatasetDetails(selectedProjectId, refreshed).catch(() => null)
+      loadDatasetDetails(selectedProjectId, refreshed).catch(meldDetailFout)
     }
   }
 
@@ -293,7 +300,7 @@ export function useDatasetWorkflow({
       return
     }
     if (!selectedClipAreaId) {
-      setDatasetDetailError('Select an area for clipping')
+      setDatasetDetailError('Kies eerst een gebied om op bij te snijden')
       return
     }
     setDatasetDetailError(null)
@@ -330,7 +337,7 @@ export function useDatasetWorkflow({
     }
     const targetId = selectedIntersectTargetId || availableVectorTargets[0]?.id
     if (!targetId) {
-      setDatasetDetailError('Select an intersect target dataset')
+      setDatasetDetailError('Kies eerst een bron om mee te doorsnijden')
       return
     }
     setDatasetDetailError(null)
@@ -414,7 +421,7 @@ export function useDatasetWorkflow({
       return
     }
     if (!selectedClipAreaId) {
-      setDatasetDetailError('Select an area for raster clip')
+      setDatasetDetailError('Kies eerst een gebied om het raster op bij te snijden')
       return
     }
     try {
@@ -521,7 +528,7 @@ export function useDatasetWorkflow({
     if (selectedDataset?.id === datasetId) {
       setSelectedDataset(refreshed)
       if (isVectorDatasetType(refreshed.dataset_type)) {
-        loadDatasetDetails(selectedProjectId, refreshed).catch(() => null)
+        loadDatasetDetails(selectedProjectId, refreshed).catch(meldDetailFout)
       }
     }
   }

frontend/src/hooks/useDeferredBackground.test.tsx

@@ -0,0 +1,51 @@
+import { cleanup, render } from '@testing-library/react'
+import { afterEach, describe, expect, it, vi } from 'vitest'
+import { useDeferredBackground } from './useDeferredBackground'
+
+function Blok(): JSX.Element {
+  const ref = useDeferredBackground<HTMLDivElement>()
+  return <div data-testid="blok" ref={ref} />
+}
+
+describe('useDeferredBackground', () => {
+  afterEach(() => {
+    cleanup()
+    vi.unstubAllGlobals()
+  })
+
+  it('zet de achtergrond pas wanneer het blok in beeld komt', () => {
+    type Terugroep = (invoeren: { isIntersecting: boolean }[]) => void
+    const waarnemers: { melden: Terugroep }[] = []
+    const disconnect = vi.fn()
+    vi.stubGlobal('IntersectionObserver', class {
+      melden: Terugroep
+      constructor(terugroep: Terugroep) {
+        this.melden = terugroep
+        waarnemers.push(this)
+      }
+      observe() {}
+      disconnect = disconnect
+    })
+    const meldIntersectie = (invoeren: { isIntersecting: boolean }[]) => {
+      for (const w of waarnemers) w.melden(invoeren)
+    }
+
+    const { getByTestId } = render(<Blok />)
+    expect(getByTestId('blok').getAttribute('data-achtergrond')).toBeNull()
+
+    meldIntersectie([{ isIntersecting: false }])
+    expect(getByTestId('blok').getAttribute('data-achtergrond')).toBeNull()
+
+    meldIntersectie([{ isIntersecting: true }])
+    expect(getByTestId('blok').getAttribute('data-achtergrond')).toBe('geladen')
+    // Eenmaal geladen hoeft er niet verder gekeken te worden.
+    expect(disconnect).toHaveBeenCalled()
+  })
+
+  it('zet de achtergrond meteen wanneer de browser niet kan waarnemen', () => {
+    vi.stubGlobal('IntersectionObserver', undefined)
+    const { getByTestId } = render(<Blok />)
+    // Liever een afbeelding te vroeg dan een leeg vlak dat nooit vult.
+    expect(getByTestId('blok').getAttribute('data-achtergrond')).toBe('geladen')
+  })
+})

frontend/src/hooks/useDeferredBackground.ts

@@ -0,0 +1,45 @@
+import { useEffect, useRef } from 'react'
+
+/**
+ * Stelt een achtergrondafbeelding uit tot het element in beeld komt.
+ *
+ * Achtergronden in CSS kennen geen loading="lazy": zodra de regel matcht, gaat
+ * het verzoek eruit. Op de landingspagina betekende dat drie afbeeldingen van
+ * samen 413 kB bij het openen, terwijl twee ervan pas ver onder de vouw staan.
+ *
+ * Het element krijgt hier pas het attribuut data-achtergrond="geladen" wanneer
+ * het in de buurt van het scherm komt; de CSS hangt de url aan dat attribuut.
+ * Zonder IntersectionObserver — of met beperkte beweging — wordt de afbeelding
+ * meteen gezet, zodat er nooit een leeg vlak achterblijft.
+ */
+export function useDeferredBackground<T extends HTMLElement>(): React.RefObject<T> {
+  const ref = useRef<T>(null)
+
+  useEffect(() => {
+    const element = ref.current
+    if (!element) return
+
+    const toon = () => element.setAttribute('data-achtergrond', 'geladen')
+
+    if (typeof IntersectionObserver === 'undefined') {
+      toon()
+      return
+    }
+
+    const waarnemer = new IntersectionObserver(
+      (invoeren) => {
+        if (invoeren.some((invoer) => invoer.isIntersecting)) {
+          toon()
+          waarnemer.disconnect()
+        }
+      },
+      // Ruim voor de vouw beginnen, zodat de afbeelding er staat voordat de
+      // gebruiker hem bereikt.
+      { rootMargin: '600px' },
+    )
+    waarnemer.observe(element)
+    return () => waarnemer.disconnect()
+  }, [])
+
+  return ref
+}

frontend/src/hooks/useDemoWorkflow.ts

@@ -77,8 +77,8 @@ export function useDemoWorkflow({
         loadQualityChecks(result.project_id),
         analysisLoads,
       ])
-      const candidateDataset = projectData?.datasets.find((dataset) => dataset.id === result.candidate_dataset_id)
-      const rasterDataset = projectData?.datasets.find((dataset) => dataset.id === result.raster_dataset_id)
+      const candidateDataset = projectData?.datasets?.find((dataset) => dataset.id === result.candidate_dataset_id)
+      const rasterDataset = projectData?.datasets?.find((dataset) => dataset.id === result.raster_dataset_id)
       if (candidateDataset) {
         await loadDatasetDetails(result.project_id, candidateDataset)
       } else if (rasterDataset) {

frontend/src/hooks/useDetectionWorkflow.test.tsx

@@ -0,0 +1,301 @@
+import { act, renderHook } from '@testing-library/react'
+import { beforeEach, describe, expect, it, vi } from 'vitest'
+import type { DetectionRunRead, JobRead, YoloPreflightResponse } from '../types'
+
+const mocks = vi.hoisted(() => ({
+  listModels: vi.fn(),
+  listModelAssets: vi.fn(),
+  getYoloPreflight: vi.fn(),
+  runAsync: vi.fn(),
+  listRuns: vi.fn(),
+  listDetections: vi.fn(),
+  getRunGeoJson: vi.fn(),
+  getRun: vi.fn(),
+  compareWithReference: vi.fn(),
+  rasterInspect: vi.fn(),
+  rasterTile: vi.fn(),
+  upload: vi.fn(),
+}))
+
+vi.mock('../services/api', () => ({
+  detectionApi: {
+    listModels: mocks.listModels,
+    listModelAssets: mocks.listModelAssets,
+    getYoloPreflight: mocks.getYoloPreflight,
+    runAsync: mocks.runAsync,
+    listRuns: mocks.listRuns,
+    listDetections: mocks.listDetections,
+    getRunGeoJson: mocks.getRunGeoJson,
+    getRun: mocks.getRun,
+    compareWithReference: mocks.compareWithReference,
+  },
+  datasetsApi: {
+    rasterInspect: mocks.rasterInspect,
+    rasterTile: mocks.rasterTile,
+    upload: mocks.upload,
+  },
+}))
+
+import { useDetectionWorkflow } from './useDetectionWorkflow'
+
+const projectId = 'project-1'
+const datasetId = 'dataset-1'
+const jobId = 'job-1'
+const analysisRunId = 'run-1'
+
+const completedJob: JobRead = {
+  id: jobId,
+  job_type: 'detection.run',
+  status: 'success',
+  project_id: projectId,
+  dataset_id: datasetId,
+  parameters_json: {},
+  result_json: { detection_count: 1 },
+}
+
+const persistedRun: DetectionRunRead = {
+  id: analysisRunId,
+  project_id: projectId,
+  dataset_id: datasetId,
+  job_id: jobId,
+  analysis_type: 'detection',
+  status: 'success',
+  model_name: 'yolo-configured',
+  parameters_json: {},
+  result_json: { detection_count: 1 },
+}
+
+function preflight(acceleratorReady: boolean): YoloPreflightResponse {
+  return {
+    model_id: 'yolo-configured',
+    status: acceleratorReady ? 'ready' : 'accelerator_unavailable',
+    message: acceleratorReady ? 'Gereed' : 'NVIDIA CUDA is niet beschikbaar',
+    checks: {
+      enabled: true,
+      dependencies_available: true,
+      accelerator_ready: acceleratorReady,
+      model_path_set: true,
+      model_file_exists: true,
+      model_load_requested: false,
+      manifest_path_set: true,
+      manifest_valid: true,
+      tile_paths_exist: true,
+      tile_limit_ok: true,
+    },
+    runtime: { dependencies_assumed: false, cuda_available: acceleratorReady },
+    tile_count: 1,
+    max_tiles: 256,
+    will_download_models: false,
+    will_run_inference: acceleratorReady,
+  }
+}
+
+function renderWorkflow() {
+  const loadProjectData = vi.fn().mockResolvedValue(undefined)
+  const loadQualityChecks = vi.fn().mockResolvedValue([])
+  const view = renderHook(() => useDetectionWorkflow({
+    selectedProjectId: projectId,
+    rasterDatasets: [],
+    qaIouThreshold: 0.5,
+    loadProjectData,
+    loadQualityChecks,
+  }))
+  return { ...view, loadProjectData }
+}
+
+describe('useDetectionWorkflow GPU execution', () => {
+  beforeEach(() => {
+    vi.clearAllMocks()
+    mocks.listRuns.mockResolvedValue({ items: [persistedRun], total: 1 })
+    mocks.listDetections.mockResolvedValue({ items: [], total: 1, truncated: false })
+    mocks.getRunGeoJson.mockResolvedValue({ type: 'FeatureCollection', features: [] })
+    mocks.listModels.mockResolvedValue({
+      models: [{
+        model_id: 'yolo-configured',
+        display_name: 'YOLO',
+        framework: 'ultralytics/pytorch',
+        task_type: 'object_detection',
+        supported_classes: ['building'],
+        configured: true,
+        status: 'configured',
+        limitation_message: '',
+        operator_review_required: true,
+      }],
+    })
+    mocks.listModelAssets.mockResolvedValue({ items: [], total: 0, model_directory: '/models' })
+  })
+
+  it('queues, follows and loads a persisted result without a synchronous inference fallback', async () => {
+    mocks.runAsync.mockResolvedValue(completedJob)
+    const { result, loadProjectData } = renderWorkflow()
+
+    act(() => {
+      result.current.setSelectedDetectionDatasetId(datasetId)
+      result.current.setDetectionTileManifestPath('/tiles/manifest.json')
+    })
+    await act(async () => {
+      await result.current.runDetection()
+    })
+
+    expect(mocks.runAsync).toHaveBeenCalledWith(expect.objectContaining({
+      project_id: projectId,
+      dataset_id: datasetId,
+      model_id: 'yolo-configured',
+      tile_manifest_path: '/tiles/manifest.json',
+    }))
+    expect(result.current.detectionJob?.status).toBe('success')
+    expect(result.current.detectionRunResult).toMatchObject({
+      analysis_run_id: analysisRunId,
+      job_id: jobId,
+      detection_count: 1,
+      status: 'success',
+    })
+    expect(result.current.detectionWorkflowStage).toBe('complete')
+    expect(result.current.detectionRunError).toBeNull()
+    expect(loadProjectData).toHaveBeenCalledWith(projectId)
+  })
+
+  it('blocks the queue when preflight says the NVIDIA accelerator is unavailable', async () => {
+    mocks.getYoloPreflight.mockResolvedValue(preflight(false))
+    const { result } = renderWorkflow()
+
+    await act(async () => {
+      await result.current.loadDetectionModels()
+    })
+    act(() => {
+      result.current.setSelectedDetectionDatasetId(datasetId)
+      result.current.setDetectionTileManifestPath('/tiles/manifest.json')
+    })
+    await act(async () => {
+      await result.current.prepareAndRunDetection()
+    })
+
+    expect(mocks.runAsync).not.toHaveBeenCalled()
+    expect(result.current.detectionWorkflowStage).toBe('failed')
+    expect(result.current.detectionRunError).toContain('NVIDIA CUDA')
+  })
+
+  it('does not let a late run list from another project overwrite the active project', async () => {
+    let resolveOlder!: (value: { items: DetectionRunRead[]; total: number }) => void
+    let resolveNewer!: (value: { items: DetectionRunRead[]; total: number }) => void
+    mocks.listRuns
+      .mockReturnValueOnce(new Promise((resolve) => { resolveOlder = resolve }))
+      .mockReturnValueOnce(new Promise((resolve) => { resolveNewer = resolve }))
+    const loadProjectData = vi.fn().mockResolvedValue(undefined)
+    const loadQualityChecks = vi.fn().mockResolvedValue([])
+    const { result, rerender } = renderHook(
+      ({ selectedProjectId }) => useDetectionWorkflow({
+        selectedProjectId,
+        rasterDatasets: [],
+        qaIouThreshold: 0.5,
+        loadProjectData,
+        loadQualityChecks,
+      }),
+      { initialProps: { selectedProjectId: 'project-1' } },
+    )
+
+    let olderRequest!: Promise<void>
+    let newerRequest!: Promise<void>
+    act(() => { olderRequest = result.current.loadDetectionRuns('project-1') })
+    rerender({ selectedProjectId: 'project-2' })
+    act(() => { newerRequest = result.current.loadDetectionRuns('project-2') })
+
+    const projectTwoRun = { ...persistedRun, id: 'run-2', project_id: 'project-2' }
+    await act(async () => {
+      resolveNewer({ items: [projectTwoRun], total: 1 })
+      await newerRequest
+    })
+    await act(async () => {
+      resolveOlder({ items: [persistedRun], total: 1 })
+      await olderRequest
+    })
+
+    expect(result.current.detectionRuns).toEqual([projectTwoRun])
+    expect(result.current.selectedDetectionRunId).toBe('run-2')
+  })
+
+  it('does not let late detection results from another project overwrite the active project', async () => {
+    type DetectionList = { items: Array<{ id: string }>; total: number; truncated: boolean }
+    type DetectionGeoJson = { type: 'FeatureCollection'; features: Array<{ id: string }> }
+    let resolveOlderList!: (value: DetectionList) => void
+    let resolveNewerList!: (value: DetectionList) => void
+    let resolveOlderGeoJson!: (value: DetectionGeoJson) => void
+    let resolveNewerGeoJson!: (value: DetectionGeoJson) => void
+    mocks.listDetections
+      .mockReturnValueOnce(new Promise((resolve) => { resolveOlderList = resolve }))
+      .mockReturnValueOnce(new Promise((resolve) => { resolveNewerList = resolve }))
+    mocks.getRunGeoJson
+      .mockReturnValueOnce(new Promise((resolve) => { resolveOlderGeoJson = resolve }))
+      .mockReturnValueOnce(new Promise((resolve) => { resolveNewerGeoJson = resolve }))
+    const loadProjectData = vi.fn().mockResolvedValue(undefined)
+    const loadQualityChecks = vi.fn().mockResolvedValue([])
+    const { result, rerender } = renderHook(
+      ({ selectedProjectId }) => useDetectionWorkflow({
+        selectedProjectId,
+        rasterDatasets: [],
+        qaIouThreshold: 0.5,
+        loadProjectData,
+        loadQualityChecks,
+      }),
+      { initialProps: { selectedProjectId: 'project-1' } },
+    )
+
+    let olderRequest!: Promise<void>
+    let newerRequest!: Promise<void>
+    act(() => { olderRequest = result.current.loadDetectionResults('run-1') })
+    rerender({ selectedProjectId: 'project-2' })
+    act(() => { newerRequest = result.current.loadDetectionResults('run-2') })
+
+    await act(async () => {
+      resolveNewerList({ items: [{ id: 'result-2' }], total: 1, truncated: false })
+      resolveNewerGeoJson({ type: 'FeatureCollection', features: [{ id: 'feature-2' }] })
+      await newerRequest
+    })
+    await act(async () => {
+      resolveOlderList({ items: [{ id: 'result-1' }], total: 1, truncated: false })
+      resolveOlderGeoJson({ type: 'FeatureCollection', features: [{ id: 'feature-1' }] })
+      await olderRequest
+    })
+
+    expect(result.current.detectionItems).toEqual([{ id: 'result-2' }])
+    expect(result.current.detectionGeoJson).toEqual({
+      type: 'FeatureCollection',
+      features: [{ id: 'feature-2' }],
+    })
+    expect(result.current.loadingDetectionResults).toBe(false)
+  })
+
+  it('drops a late queue response when the user has already changed project', async () => {
+    let resolveQueuedJob!: (value: JobRead) => void
+    mocks.runAsync.mockReturnValue(new Promise((resolve) => { resolveQueuedJob = resolve }))
+    const loadProjectData = vi.fn().mockResolvedValue(undefined)
+    const loadQualityChecks = vi.fn().mockResolvedValue([])
+    const { result, rerender } = renderHook(
+      ({ selectedProjectId }) => useDetectionWorkflow({
+        selectedProjectId,
+        rasterDatasets: [],
+        qaIouThreshold: 0.5,
+        loadProjectData,
+        loadQualityChecks,
+      }),
+      { initialProps: { selectedProjectId: 'project-1' } },
+    )
+    act(() => {
+      result.current.setSelectedDetectionDatasetId(datasetId)
+      result.current.setDetectionTileManifestPath('/tiles/manifest.json')
+    })
+
+    let request!: Promise<void>
+    act(() => { request = result.current.runDetection() })
+    rerender({ selectedProjectId: 'project-2' })
+    await act(async () => {
+      resolveQueuedJob(completedJob)
+      await request
+    })
+
+    expect(result.current.detectionJob).toBeNull()
+    expect(result.current.detectionRunResult).toBeNull()
+    expect(result.current.runningDetection).toBe(false)
+    expect(mocks.getRun).not.toHaveBeenCalled()
+  })
+})

frontend/src/hooks/useDetectionWorkflow.ts

@@ -1,4 +1,4 @@
-import { useState } from 'react'
+import { useEffect, useRef, useState } from 'react'
 import { datasetsApi, detectionApi } from '../services/api'
 import type {
   DatasetCreateResponse,
@@ -13,6 +13,12 @@ import type {
   YoloPreflightResponse,
 } from '../types'
 import { formatError } from '../lib/formatError'
+import {
+  analysisRunIdFromJob,
+  completedDetectionResponse,
+  DetectionJobError,
+  waitForDetectionJob,
+} from '../services/detectionJob'
 
 interface DetectionWorkflowOptions {
   selectedProjectId: string | null
@@ -88,6 +94,16 @@ function rasterTileCount(metadata: Record<string, unknown>, tileSize: number, ov
   return Math.ceil(width / step) * Math.ceil(height / step)
 }
 
+function isAbortError(error: unknown): boolean {
+  return error instanceof Error && error.name === 'AbortError'
+}
+
+function abortedError(): Error {
+  const error = new Error('Het volgen van de detectietaak is gestopt')
+  error.name = 'AbortError'
+  return error
+}
+
 export function useDetectionWorkflow({
   selectedProjectId,
   rasterDatasets,
@@ -106,6 +122,7 @@ export function useDetectionWorkflow({
   const [detectionTileManifestPath, setDetectionTileManifestPath] = useState('')
   const [detectionConfidenceThreshold, setDetectionConfidenceThreshold] = useState(0.15)
   const [runningDetection, setRunningDetection] = useState(false)
+  const [detectionJob, setDetectionJob] = useState<JobRead | null>(null)
   const [detectionRunResult, setDetectionRunResult] = useState<DetectionRunResponse | null>(null)
   const [detectionRunError, setDetectionRunError] = useState<string | null>(null)
   const [detectionRuns, setDetectionRuns] = useState<DetectionRunRead[]>([])
@@ -130,6 +147,36 @@ export function useDetectionWorkflow({
   const [detectionCalibrationRows, setDetectionCalibrationRows] = useState<DetectionCalibrationRunRow[]>([])
   const [detectionCalibrationError, setDetectionCalibrationError] = useState<string | null>(null)
   const [detectionWorkflowStage, setDetectionWorkflowStage] = useState<DetectionWorkflowStage>('idle')
+  const activeDetectionControllerRef = useRef<AbortController | null>(null)
+  const selectedProjectIdRef = useRef(selectedProjectId)
+  const detectionExecutionSequence = useRef(0)
+  const detectionRunsRequestSequence = useRef(0)
+  const detectionResultsRequestSequence = useRef(0)
+  const detectionQaRequestSequence = useRef(0)
+  const detectionCalibrationSequence = useRef(0)
+  selectedProjectIdRef.current = selectedProjectId
+
+  useEffect(() => {
+    activeDetectionControllerRef.current?.abort()
+    activeDetectionControllerRef.current = null
+    detectionExecutionSequence.current += 1
+    detectionQaRequestSequence.current += 1
+    detectionCalibrationSequence.current += 1
+    setDetectionJob(null)
+    setRunningDetection(false)
+    setDetectionRunResult(null)
+    setDetectionRunError(null)
+    setDetectionWorkflowStage('idle')
+    setDetectionQaResult(null)
+    setDetectionQaError(null)
+    setRunningDetectionQa(false)
+    setDetectionCalibrationRows([])
+    setDetectionCalibrationError(null)
+    setRunningDetectionCalibration(false)
+    return () => {
+      activeDetectionControllerRef.current?.abort()
+    }
+  }, [selectedProjectId])
 
   const loadDetectionModels = async () => {
     setLoadingDetectionModels(true)
@@ -146,7 +193,7 @@ export function useDetectionWorkflow({
         setSelectedDetectionModelId(configuredModel?.model_id ?? response.models[0].model_id)
       }
     } catch (error) {
-      setDetectionModelError(formatError(error, 'Failed to load detection models'))
+      setDetectionModelError(formatError(error, 'De detectiemodellen konden niet worden geladen'))
     }
     try {
       const assetResponse = await detectionApi.listModelAssets()
@@ -160,11 +207,11 @@ export function useDetectionWorkflow({
         setYoloPreflight(preflight)
         setYoloPreflightError(null)
       } catch (error) {
-        setYoloPreflightError(formatError(error, 'Failed to load YOLO preflight status'))
+        setYoloPreflightError(formatError(error, 'De modelcontrole kon niet worden opgehaald'))
       }
     } catch (error) {
       setModelAssets([])
-      setModelAssetError(formatError(error, 'Failed to load local model assets'))
+      setModelAssetError(formatError(error, 'De lokale modelbestanden konden niet worden geladen'))
     } finally {
       setLoadingDetectionModels(false)
     }
@@ -180,33 +227,43 @@ export function useDetectionWorkflow({
       })
       setYoloPreflight(response)
     } catch (error) {
-      setYoloPreflightError(formatError(error, 'Failed to load YOLO preflight status'))
+      setYoloPreflightError(formatError(error, 'De modelcontrole kon niet worden opgehaald'))
     } finally {
       setLoadingYoloPreflight(false)
     }
   }
 
   const loadDetectionRuns = async (projectId = selectedProjectId) => {
+    const sequence = detectionRunsRequestSequence.current + 1
+    detectionRunsRequestSequence.current = sequence
     if (!projectId) {
       setDetectionRuns([])
       return
     }
     try {
       const response = await detectionApi.listRuns({ project_id: projectId })
+      if (
+        detectionRunsRequestSequence.current !== sequence
+        || selectedProjectIdRef.current !== projectId
+      ) return
       setDetectionRuns(response.items)
-      if (!selectedDetectionRunId && response.items.length > 0) {
-        setSelectedDetectionRunId(response.items[0].id)
-      }
+      setSelectedDetectionRunId((current) => current || response.items[0]?.id || '')
     } catch (error) {
-      setDetectionRunError(formatError(error, 'Failed to load detection runs'))
+      if (
+        detectionRunsRequestSequence.current === sequence
+        && selectedProjectIdRef.current === projectId
+      ) {
+        setDetectionRunError(formatError(error, 'De detectieruns konden niet worden geladen'))
+      }
     }
   }
 
   const loadDetectionResults = async (analysisRunId = selectedDetectionRunId) => {
-    if (!analysisRunId) {
+    const sequence = detectionResultsRequestSequence.current + 1
+    detectionResultsRequestSequence.current = sequence
+    const requestProjectId = selectedProjectIdRef.current
+    if (!analysisRunId || !requestProjectId) {
       setDetectionItems([])
-    setDetectionTotal(0)
-    setDetectionTruncated(false)
       setDetectionTotal(0)
       setDetectionTruncated(false)
       setDetectionGeoJson(null)
@@ -216,7 +273,7 @@ export function useDetectionWorkflow({
     setDetectionRunError(null)
     try {
       const params = {
-        project_id: selectedProjectId ?? '',
+        project_id: requestProjectId,
         class_name: detectionClassFilter || null,
         min_confidence: detectionMinConfidenceFilter > 0 ? detectionMinConfidenceFilter : null,
       }
@@ -224,14 +281,28 @@ export function useDetectionWorkflow({
         detectionApi.listDetections(analysisRunId, params),
         detectionApi.getRunGeoJson(analysisRunId, params),
       ])
+      if (
+        detectionResultsRequestSequence.current !== sequence
+        || selectedProjectIdRef.current !== requestProjectId
+      ) return
       setDetectionItems(detectionsResponse.items)
       setDetectionTotal(detectionsResponse.total)
       setDetectionTruncated(Boolean(detectionsResponse.truncated))
       setDetectionGeoJson(geoJsonResponse)
     } catch (error) {
-      setDetectionRunError(formatError(error, 'Failed to load detection results'))
+      if (
+        detectionResultsRequestSequence.current === sequence
+        && selectedProjectIdRef.current === requestProjectId
+      ) {
+        setDetectionRunError(formatError(error, 'De detectieresultaten konden niet worden geladen'))
+      }
     } finally {
-      setLoadingDetectionResults(false)
+      if (
+        detectionResultsRequestSequence.current === sequence
+        && selectedProjectIdRef.current === requestProjectId
+      ) {
+        setLoadingDetectionResults(false)
+      }
     }
   }
 
@@ -241,33 +312,102 @@ export function useDetectionWorkflow({
     manifestPath: string | null,
     modelId = selectedDetectionModelId,
     modelAssetId = selectedModelAssetId,
+    confidenceThreshold = detectionConfidenceThreshold,
+    parametersJson: Record<string, unknown> = {},
   ) => {
-    const result = await detectionApi.run({
+    if (
+      (activeDetectionControllerRef.current && !activeDetectionControllerRef.current.signal.aborted)
+      || detectionJob?.status === 'queued'
+      || detectionJob?.status === 'running'
+    ) {
+      throw new DetectionJobError(
+        'Er wordt al een GPU-detectietaak gevolgd. Wacht tot die taak klaar is voordat u een nieuwe start.',
+        'DETECTION_JOB_ALREADY_ACTIVE',
+        detectionJob?.id ?? 'unknown',
+      )
+    }
+
+    const request = {
       project_id: projectId,
       dataset_id: datasetId,
       model_id: modelId,
       model_asset_id: modelAssetId || null,
-      confidence_threshold: detectionConfidenceThreshold,
+      confidence_threshold: confidenceThreshold,
       tile_manifest_path: manifestPath,
-      parameters_json: {},
-    })
-    setDetectionRunResult(result)
-    setSelectedDetectionRunId(result.analysis_run_id)
-    setDetectionWorkflowStage('loading')
-    await loadDetectionRuns(projectId)
-    await loadDetectionResults(result.analysis_run_id)
-    await loadProjectData(projectId)
-    return result
+      parameters_json: parametersJson,
+    }
+    const controller = new AbortController()
+    const executionSequence = detectionExecutionSequence.current + 1
+    detectionExecutionSequence.current = executionSequence
+    activeDetectionControllerRef.current = controller
+    const assertExecutionCurrent = () => {
+      if (
+        controller.signal.aborted
+        || detectionExecutionSequence.current !== executionSequence
+        || selectedProjectIdRef.current !== projectId
+      ) {
+        throw abortedError()
+      }
+    }
+    try {
+      setDetectionJob(null)
+      const queuedJob = await detectionApi.runAsync(request)
+      assertExecutionCurrent()
+      setDetectionJob(queuedJob)
+      const completedJob = await waitForDetectionJob({
+        projectId,
+        initialJob: queuedJob,
+        signal: controller.signal,
+        onStatus: (job) => {
+          if (
+            detectionExecutionSequence.current === executionSequence
+            && selectedProjectIdRef.current === projectId
+          ) {
+            setDetectionJob(job)
+          }
+        },
+      })
+      assertExecutionCurrent()
+      const explicitAnalysisRunId = analysisRunIdFromJob(completedJob)
+      const run = explicitAnalysisRunId
+        ? await detectionApi.getRun(explicitAnalysisRunId, projectId)
+        : (await detectionApi.listRuns({ project_id: projectId, dataset_id: datasetId })).items
+            .find((candidate) => candidate.job_id === completedJob.id)
+      assertExecutionCurrent()
+      if (!run) {
+        throw new DetectionJobError(
+          'De GPU-taak is voltooid, maar de bijbehorende bewaarde detectierun ontbreekt.',
+          'DETECTION_RUN_RESULT_NOT_FOUND',
+          completedJob.id,
+        )
+      }
+      const result = completedDetectionResponse(request, completedJob, run)
+      setDetectionRunResult(result)
+      setSelectedDetectionRunId(result.analysis_run_id)
+      setDetectionWorkflowStage('loading')
+      await loadDetectionRuns(projectId)
+      assertExecutionCurrent()
+      await loadDetectionResults(result.analysis_run_id)
+      assertExecutionCurrent()
+      await loadProjectData(projectId)
+      assertExecutionCurrent()
+      return result
+    } finally {
+      if (activeDetectionControllerRef.current === controller) {
+        activeDetectionControllerRef.current = null
+      }
+    }
   }
 
   const runDetection = async () => {
     if (!selectedProjectId) {
-      setDetectionRunError('Select a project first')
+      setDetectionRunError('Kies eerst een werkruimte')
       return
     }
+    const projectId = selectedProjectId
     const datasetId = selectedDetectionDatasetId
     if (!datasetId) {
-      setDetectionRunError('Select a raster dataset')
+      setDetectionRunError('Kies eerst een rasterbron')
       return
     }
     setDetectionRunError(null)
@@ -275,13 +415,19 @@ export function useDetectionWorkflow({
     setRunningDetection(true)
     setDetectionWorkflowStage('detecting')
     try {
-      await executeDetection(selectedProjectId, datasetId, detectionTileManifestPath.trim() || null)
-      setDetectionWorkflowStage('complete')
+      await executeDetection(projectId, datasetId, detectionTileManifestPath.trim() || null)
+      if (selectedProjectIdRef.current === projectId) {
+        setDetectionWorkflowStage('complete')
+      }
     } catch (error) {
-      setDetectionRunError(formatError(error, 'Detection run failed'))
-      setDetectionWorkflowStage('failed')
+      if (!isAbortError(error) && selectedProjectIdRef.current === projectId) {
+        setDetectionRunError(formatError(error, 'Detection run failed'))
+        setDetectionWorkflowStage('failed')
+      }
     } finally {
-      setRunningDetection(false)
+      if (selectedProjectIdRef.current === projectId) {
+        setRunningDetection(false)
+      }
     }
   }
 
@@ -290,10 +436,11 @@ export function useDetectionWorkflow({
       setDetectionRunError('De regionale werkruimte is nog niet geladen')
       return false
     }
+    const projectId = selectedProjectId
     setDetectionRunError(null)
     setDetectionWorkflowStage('uploading')
     try {
-      const dataset = await datasetsApi.upload(selectedProjectId, {
+      const dataset = await datasetsApi.upload(projectId, {
         file,
         datasetType: 'raster',
         source: 'user_upload',
@@ -302,15 +449,19 @@ export function useDetectionWorkflow({
         sourceMetadataJson: JSON.stringify({ purpose: 'building_detection' }),
         provenanceMetadataJson: JSON.stringify({ original_filename: file.name, acquisition: 'explicit_user_upload' }),
       })
+      if (selectedProjectIdRef.current !== projectId) throw abortedError()
       setSelectedDetectionDatasetId(dataset.id)
       setDetectionTileManifestPath('')
       setDetectionRunResult(null)
       setDetectionWorkflowStage('ready')
-      await loadProjectData(selectedProjectId)
+      await loadProjectData(projectId)
+      if (selectedProjectIdRef.current !== projectId) throw abortedError()
       return true
     } catch (error) {
-      setDetectionRunError(formatError(error, 'Het luchtbeeld kon niet worden toegevoegd'))
-      setDetectionWorkflowStage('failed')
+      if (!isAbortError(error) && selectedProjectIdRef.current === projectId) {
+        setDetectionRunError(formatError(error, 'Het luchtbeeld kon niet worden toegevoegd'))
+        setDetectionWorkflowStage('failed')
+      }
       return false
     }
   }
@@ -323,6 +474,10 @@ export function useDetectionWorkflow({
       setDetectionRunError('De regionale werkruimte is nog niet geladen')
       return null
     }
+    const projectId = selectedProjectId
+    const assertProjectCurrent = () => {
+      if (selectedProjectIdRef.current !== projectId) throw abortedError()
+    }
     const datasetId = datasetIdOverride || selectedDetectionDatasetId
     if (!datasetId) {
       setDetectionRunError('Kies of voeg eerst een gegeorefereerd luchtbeeld toe')
@@ -334,7 +489,7 @@ export function useDetectionWorkflow({
       : selectedModelAssetId
     const selectedModel = detectionModels.find((model) => model.model_id === effectiveModelId)
     if (!selectedModel?.configured || effectiveModelId === 'manual-fixture-detector') {
-      setDetectionRunError(selectedModel?.limitation_message ?? 'Het gekozen analysemodel is niet beschikbaar')
+      setDetectionRunError('Het gekozen productie-analysemodel is niet beschikbaar; vernieuw de modelstatus en controleer de serverconfiguratie')
       return null
     }
     if (effectiveModelId === 'yolo-configured' && modelAssets.length > 0 && !effectiveModelAssetId) {
@@ -349,7 +504,8 @@ export function useDetectionWorkflow({
       let manifestPath = detectionTileManifestPath.trim()
       if (!manifestPath) {
         setDetectionWorkflowStage('tiling')
-        const inspection = await datasetsApi.rasterInspect(selectedProjectId, datasetId)
+        const inspection = await datasetsApi.rasterInspect(projectId, datasetId)
+        assertProjectCurrent()
         const expectedTileCount = rasterTileCount(inspection.metadata, 512, 64)
         const maxTiles = yoloPreflight?.max_tiles ?? 256
         if (expectedTileCount === null) {
@@ -360,10 +516,11 @@ export function useDetectionWorkflow({
             `Dit luchtbeeld zou ${expectedTileCount} beeldtegels maken; het veilige maximum is ${maxTiles}. Knip het beeld eerst tot het gewenste werkgebied.`,
           )
         }
-        const tileJob = await datasetsApi.rasterTile(selectedProjectId, datasetId, {
+        const tileJob = await datasetsApi.rasterTile(projectId, datasetId, {
           tile_size: 512,
           overlap: 64,
         })
+        assertProjectCurrent()
         manifestPath = tileManifestPathFromJob(tileJob) ?? ''
         if (!manifestPath) {
           throw new Error(tileJob.error_message || 'De tegelvoorbereiding leverde geen geldig manifest op')
@@ -376,6 +533,7 @@ export function useDetectionWorkflow({
         tile_manifest_path: manifestPath,
         model_asset_id: effectiveModelAssetId || null,
       })
+      assertProjectCurrent()
       setYoloPreflight(preflight)
       setYoloPreflightError(null)
       if (
@@ -383,6 +541,7 @@ export function useDetectionWorkflow({
         !preflight.checks.tile_paths_exist ||
         !preflight.checks.tile_limit_ok ||
         !preflight.checks.dependencies_available ||
+        preflight.checks.accelerator_ready !== true ||
         !preflight.checks.model_file_exists
       ) {
         throw new Error(preflight.message || 'De beeldtegels of modelruntime zijn niet startklaar')
@@ -390,20 +549,25 @@ export function useDetectionWorkflow({
 
       setDetectionWorkflowStage('detecting')
       const result = await executeDetection(
-        selectedProjectId,
+        projectId,
         datasetId,
         manifestPath,
         effectiveModelId,
         effectiveModelAssetId,
       )
+      assertProjectCurrent()
       setDetectionWorkflowStage('complete')
       return result
     } catch (error) {
-      setDetectionRunError(formatError(error, 'De beeldanalyse is mislukt'))
-      setDetectionWorkflowStage('failed')
+      if (!isAbortError(error) && selectedProjectIdRef.current === projectId) {
+        setDetectionRunError(formatError(error, 'De beeldanalyse is mislukt'))
+        setDetectionWorkflowStage('failed')
+      }
       return null
     } finally {
-      setRunningDetection(false)
+      if (selectedProjectIdRef.current === projectId) {
+        setRunningDetection(false)
+      }
     }
   }
 
@@ -414,33 +578,58 @@ export function useDetectionWorkflow({
     iouThresholdOverride?: number,
   ): Promise<DetectionQaResult | null> => {
     if (!analysisRunId) {
-      setDetectionQaError('Select a detection run')
+      setDetectionQaError('Kies eerst een detectierun')
       return null
     }
     if (!referenceDatasetId) {
-      setDetectionQaError('Select a reference dataset')
+      setDetectionQaError('Kies eerst een referentiebron')
       return null
     }
+    const projectId = selectedProjectIdRef.current
+    if (!projectId) {
+      setDetectionQaError('Kies eerst een werkruimte')
+      return null
+    }
+    const sequence = detectionQaRequestSequence.current + 1
+    detectionQaRequestSequence.current = sequence
     setSelectedDetectionRunId(analysisRunId)
     setDetectionReferenceDatasetId(referenceDatasetId)
     setDetectionQaError(null)
     setDetectionQaResult(null)
     setRunningDetectionQa(true)
     try {
-      const result = await detectionApi.compareWithReference(analysisRunId, selectedProjectId!, {
+      const result = await detectionApi.compareWithReference(analysisRunId, projectId, {
         reference_dataset_id: referenceDatasetId,
         iou_threshold: iouThresholdOverride ?? qaIouThreshold,
         class_name: useCurrentFilters ? detectionClassFilter || null : null,
         min_confidence: useCurrentFilters && detectionMinConfidenceFilter > 0 ? detectionMinConfidenceFilter : null,
       })
+      if (
+        detectionQaRequestSequence.current !== sequence
+        || selectedProjectIdRef.current !== projectId
+      ) return null
       setDetectionQaResult(result)
-      await loadQualityChecks(selectedProjectId)
+      await loadQualityChecks(projectId)
+      if (
+        detectionQaRequestSequence.current !== sequence
+        || selectedProjectIdRef.current !== projectId
+      ) return null
       return result
     } catch (error) {
-      setDetectionQaError(formatError(error, 'Detection QA failed'))
+      if (
+        detectionQaRequestSequence.current === sequence
+        && selectedProjectIdRef.current === projectId
+      ) {
+        setDetectionQaError(formatError(error, 'Detection QA failed'))
+      }
       return null
     } finally {
-      setRunningDetectionQa(false)
+      if (
+        detectionQaRequestSequence.current === sequence
+        && selectedProjectIdRef.current === projectId
+      ) {
+        setRunningDetectionQa(false)
+      }
     }
   }
 
@@ -449,36 +638,46 @@ export function useDetectionWorkflow({
 
   const runDetectionCalibration = async () => {
     if (!selectedProjectId) {
-      setDetectionCalibrationError('Select a project before calibration')
+      setDetectionCalibrationError('Kies eerst een werkruimte om te kalibreren')
       return
     }
+    const projectId = selectedProjectId
     const datasetId = selectedDetectionDatasetId
     if (!datasetId) {
-      setDetectionCalibrationError('Select a raster dataset before calibration')
+      setDetectionCalibrationError('Kies eerst een rasterbron om te kalibreren')
       return
     }
     if (!detectionReferenceDatasetId) {
-      setDetectionCalibrationError('Select a reference dataset before calibration')
+      setDetectionCalibrationError('Kies eerst een referentiebron om te kalibreren')
       return
     }
+    const referenceDatasetId = detectionReferenceDatasetId
     const selectedModel = detectionModels.find((model) => model.model_id === selectedDetectionModelId)
     if (!selectedModel?.configured || selectedDetectionModelId === 'manual-fixture-detector') {
-      setDetectionCalibrationError('Select a configured non-fixture detection model before calibration')
+      setDetectionCalibrationError('Kies eerst een geconfigureerd detectiemodel; testgegevens kunnen niet gekalibreerd worden')
       return
     }
     if (selectedDetectionModelId === 'yolo-configured' && !detectionTileManifestPath.trim()) {
-      setDetectionCalibrationError('Configured YOLO calibration requires a tile manifest')
+      setDetectionCalibrationError('Kalibratie met YOLO vereist een beeldtegelmanifest')
       return
     }
     if (selectedDetectionModelId === 'yolo-configured' && modelAssets.length > 0 && !selectedModelAssetId) {
-      setDetectionCalibrationError('Select a local model asset before calibration')
+      setDetectionCalibrationError('Kies eerst een lokaal modelbestand om te kalibreren')
       return
     }
     const thresholds = parseCalibrationThresholds(calibrationThresholdText)
     if (thresholds.length === 0) {
-      setDetectionCalibrationError('Provide at least one valid threshold between 0 and 1')
+      setDetectionCalibrationError('Geef minstens één geldige drempel tussen 0 en 1 op')
       return
     }
+    const sequence = detectionCalibrationSequence.current + 1
+    detectionCalibrationSequence.current = sequence
+    const assertCalibrationCurrent = () => {
+      if (
+        detectionCalibrationSequence.current !== sequence
+        || selectedProjectIdRef.current !== projectId
+      ) throw abortedError()
+    }
     setDetectionCalibrationError(null)
     setDetectionCalibrationRows(thresholds.map((threshold) => ({ threshold, status: 'queued' })))
     setRunningDetectionCalibration(true)
@@ -492,24 +691,28 @@ export function useDetectionWorkflow({
       setDetectionCalibrationRows((rows) =>
         rows.map((row) => ({ ...row, status: 'running', message: 'Eén inferentie voor alle drempels' })),
       )
-      const result = await detectionApi.run({
-        project_id: selectedProjectId,
-        dataset_id: datasetId,
-        model_id: selectedDetectionModelId,
-        model_asset_id: selectedModelAssetId || null,
-        confidence_threshold: lowestThreshold,
-        tile_manifest_path: detectionTileManifestPath.trim() || null,
-        parameters_json: { calibration: true, calibration_thresholds: thresholds },
-      })
+      setDetectionWorkflowStage('detecting')
+      const result = await executeDetection(
+        projectId,
+        datasetId,
+        detectionTileManifestPath.trim() || null,
+        selectedDetectionModelId,
+        selectedModelAssetId,
+        lowestThreshold,
+        { calibration: true, calibration_thresholds: thresholds },
+      )
+      assertCalibrationCurrent()
+      setDetectionWorkflowStage('complete')
       setSelectedDetectionRunId(result.analysis_run_id)
 
-      const qa = await detectionApi.compareWithReference(result.analysis_run_id, selectedProjectId, {
-        reference_dataset_id: detectionReferenceDatasetId,
+      const qa = await detectionApi.compareWithReference(result.analysis_run_id, projectId, {
+        reference_dataset_id: referenceDatasetId,
         iou_threshold: qaIouThreshold,
         class_name: detectionClassFilter || null,
         min_confidence: null,
         calibration_thresholds: thresholds,
       })
+      assertCalibrationCurrent()
 
       const sweep = new Map((qa.calibration_sweep ?? []).map((point) => [point.min_confidence, point]))
       setDetectionCalibrationRows((rows) =>
@@ -536,17 +739,31 @@ export function useDetectionWorkflow({
         }),
       )
 
-      await loadDetectionRuns(selectedProjectId)
-      await loadQualityChecks(selectedProjectId)
-      await loadProjectData(selectedProjectId)
+      await loadDetectionRuns(projectId)
+      assertCalibrationCurrent()
+      await loadQualityChecks(projectId)
+      assertCalibrationCurrent()
+      await loadProjectData(projectId)
+      assertCalibrationCurrent()
     } catch (error) {
-      const message = formatError(error, 'Calibration failed')
-      setDetectionCalibrationRows((rows) =>
-        rows.map((row) => (row.status === 'success' ? row : { ...row, status: 'failed', message })),
-      )
-      setDetectionCalibrationError(message)
+      if (
+        !isAbortError(error)
+        && detectionCalibrationSequence.current === sequence
+        && selectedProjectIdRef.current === projectId
+      ) {
+        const message = formatError(error, 'Kalibratie mislukt')
+        setDetectionCalibrationRows((rows) =>
+          rows.map((row) => (row.status === 'success' ? row : { ...row, status: 'failed', message })),
+        )
+        setDetectionCalibrationError(message)
+      }
     } finally {
-      setRunningDetectionCalibration(false)
+      if (
+        detectionCalibrationSequence.current === sequence
+        && selectedProjectIdRef.current === projectId
+      ) {
+        setRunningDetectionCalibration(false)
+      }
     }
   }
 
@@ -557,14 +774,32 @@ export function useDetectionWorkflow({
   }
 
   const resetDetectionForProject = () => {
+    detectionExecutionSequence.current += 1
+    detectionRunsRequestSequence.current += 1
+    detectionResultsRequestSequence.current += 1
+    detectionQaRequestSequence.current += 1
+    detectionCalibrationSequence.current += 1
+    activeDetectionControllerRef.current?.abort()
+    activeDetectionControllerRef.current = null
     setSelectedDetectionDatasetId('')
     setDetectionRuns([])
     setSelectedDetectionRunId('')
     setDetectionItems([])
+    setDetectionTotal(0)
+    setDetectionTruncated(false)
     setDetectionGeoJson(null)
     setDetectionRunResult(null)
+    setDetectionJob(null)
+    setDetectionReferenceDatasetId('')
+    setDetectionQaResult(null)
+    setDetectionQaError(null)
+    setRunningDetectionQa(false)
     setDetectionCalibrationRows([])
     setDetectionCalibrationError(null)
+    setRunningDetectionCalibration(false)
+    setDetectionRunError(null)
+    setLoadingDetectionResults(false)
+    setRunningDetection(false)
     setDetectionWorkflowStage('idle')
   }
 
@@ -580,6 +815,7 @@ export function useDetectionWorkflow({
     detectionTileManifestPath,
     detectionConfidenceThreshold,
     runningDetection,
+    detectionJob,
     detectionRunResult,
     detectionRunError,
     detectionRuns,

frontend/src/hooks/useExportWorkflow.ts

@@ -45,7 +45,7 @@ export function useExportWorkflow({
       const response = await exportsApi.listProjectExports(projectId)
       setExports(response.items)
     } catch (error) {
-      setExportError(formatError(error, 'Failed to load exports'))
+      setExportError(formatError(error, 'De downloads konden niet worden geladen'))
     } finally {
       setLoadingExports(false)
     }
@@ -53,7 +53,7 @@ export function useExportWorkflow({
 
   const exportSelectedDatasetGeoJson = async () => {
     if (!selectedDataset || !isVectorDatasetType(selectedDataset.dataset_type)) {
-      setExportError('Select a vector dataset before exporting GeoJSON.')
+      setExportError('Kies eerst een vectorbron om als GeoJSON te bewaren.')
       return
     }
     setExporting(true)
@@ -67,7 +67,7 @@ export function useExportWorkflow({
       setLatestExport(response)
       await loadExports(selectedDataset.project_id)
     } catch (error) {
-      setExportError(formatError(error, 'Failed to export selected dataset'))
+      setExportError(formatError(error, 'De gekozen bron kon niet worden geëxporteerd'))
     } finally {
       setExporting(false)
     }
@@ -75,7 +75,7 @@ export function useExportWorkflow({
 
   const exportSelectedDetectionRunGeoJson = async () => {
     if (!selectedDetectionRunId || !selectedProjectId) {
-      setExportError('Select a detection run before exporting GeoJSON.')
+      setExportError('Kies eerst een detectierun om als GeoJSON te bewaren.')
       return
     }
     setExporting(true)
@@ -89,7 +89,7 @@ export function useExportWorkflow({
       setLatestExport(response)
       await loadExports(selectedProjectId)
     } catch (error) {
-      setExportError(formatError(error, 'Failed to export detection run'))
+      setExportError(formatError(error, 'De detectierun kon niet worden geëxporteerd'))
     } finally {
       setExporting(false)
     }
@@ -97,7 +97,7 @@ export function useExportWorkflow({
 
   const exportSelectedSegmentationRunGeoJson = async () => {
     if (!selectedSegmentationRunId || !selectedProjectId) {
-      setExportError('Select a segmentation run before exporting GeoJSON.')
+      setExportError('Kies eerst een segmentatierun om als GeoJSON te bewaren.')
       return
     }
     setExporting(true)
@@ -110,7 +110,7 @@ export function useExportWorkflow({
       setLatestExport(response)
       await loadExports(selectedProjectId)
     } catch (error) {
-      setExportError(formatError(error, 'Failed to export segmentation run'))
+      setExportError(formatError(error, 'De segmentatierun kon niet worden geëxporteerd'))
     } finally {
       setExporting(false)
     }
@@ -118,7 +118,7 @@ export function useExportWorkflow({
 
   const exportMapSelectionGeoJson = async (bbox: VectorSelectionBBox, areaId?: string) => {
     if (!selectedDataset || !isVectorDatasetType(selectedDataset.dataset_type)) {
-      setSelectionExportError('Select a vector dataset before saving an area export.')
+      setSelectionExportError('Kies eerst een vectorbron om het gebied mee te bewaren.')
       return null
     }
     setSelectionExporting(true)
@@ -137,7 +137,7 @@ export function useExportWorkflow({
       await loadExports(selectedDataset.project_id)
       return response
     } catch (error) {
-      setSelectionExportError(formatError(error, 'Failed to save area export'))
+      setSelectionExportError(formatError(error, 'De gebiedsdownload kon niet worden bewaard'))
       return null
     } finally {
       setSelectionExporting(false)
@@ -146,7 +146,7 @@ export function useExportWorkflow({
 
   const exportProjectMetadata = async () => {
     if (!selectedProjectId) {
-      setExportError('Select a project before exporting metadata.')
+      setExportError('Kies eerst een werkruimte om de projectgegevens te bewaren.')
       return
     }
     setExporting(true)
@@ -156,7 +156,7 @@ export function useExportWorkflow({
       setLatestExport(response)
       await loadExports(selectedProjectId)
     } catch (error) {
-      setExportError(formatError(error, 'Failed to export project metadata'))
+      setExportError(formatError(error, 'De projectgegevens konden niet worden geëxporteerd'))
     } finally {
       setExporting(false)
     }
@@ -164,7 +164,7 @@ export function useExportWorkflow({
 
   const exportProjectReport = async () => {
     if (!selectedProjectId) {
-      setExportError('Select a project before exporting a report.')
+      setExportError('Kies eerst een werkruimte om een rapport te maken.')
       return
     }
     setExporting(true)
@@ -174,7 +174,7 @@ export function useExportWorkflow({
       setLatestExport(response)
       await loadExports(selectedProjectId)
     } catch (error) {
-      setExportError(formatError(error, 'Failed to export project report'))
+      setExportError(formatError(error, 'Het projectrapport kon niet worden gemaakt'))
     } finally {
       setExporting(false)
     }
@@ -204,7 +204,7 @@ export function useExportWorkflow({
       const response = await exportsApi.getContent(selectedProjectId, exportId)
       setExportPreview(response.content)
     } catch (error) {
-      setExportError(formatError(error, 'Failed to load export content'))
+      setExportError(formatError(error, 'De inhoud van de download kon niet worden geladen'))
     }
   }
 

frontend/src/hooks/useGeoAssistant.test.tsx

@@ -0,0 +1,117 @@
+import { act, renderHook, waitFor } from '@testing-library/react'
+import { beforeEach, describe, expect, it, vi } from 'vitest'
+import type { AssistantQueryResponse } from '../types'
+
+const mocks = vi.hoisted(() => ({
+  status: vi.fn(),
+  models: vi.fn(),
+  query: vi.fn(),
+}))
+
+vi.mock('../services/api/assistant', () => ({
+  assistantApi: mocks,
+}))
+
+import { useGeoAssistant } from './useGeoAssistant'
+
+function deferred<T>() {
+  let resolve!: (value: T) => void
+  let reject!: (reason?: unknown) => void
+  const promise = new Promise<T>((resolvePromise, rejectPromise) => {
+    resolve = resolvePromise
+    reject = rejectPromise
+  })
+  return { promise, resolve, reject }
+}
+
+function response(answer: string): AssistantQueryResponse {
+  return {
+    answer,
+    model: 'geo-model',
+    scope_label: 'testgebied',
+    context_metrics: [],
+    temporal_series: [],
+    source_dataset_ids: [],
+    warnings: [],
+    generated_at: '2026-08-23T12:00:00Z',
+  }
+}
+
+describe('useGeoAssistant request scope', () => {
+  beforeEach(() => {
+    window.localStorage.clear()
+    mocks.status.mockResolvedValue({
+      enabled: true,
+      reachable: true,
+      status: 'ready',
+      base_url: 'http://localhost',
+      default_model: 'geo-model',
+      model_count: 1,
+      limitation_message: '',
+    })
+    mocks.models.mockResolvedValue({
+      items: [{ name: 'geo-model', capabilities: ['chat'] }],
+      total: 1,
+      default_model: 'geo-model',
+    })
+  })
+
+  it('ignores an answer that returns after the active project changed', async () => {
+    const pending = deferred<AssistantQueryResponse>()
+    mocks.query.mockReturnValueOnce(pending.promise)
+    const { result, rerender } = renderHook(
+      ({ projectId }) => useGeoAssistant({
+        selectedProjectId: projectId,
+        selectedAreaId: null,
+        selectionBbox: null,
+      }),
+      { initialProps: { projectId: 'project-1' } },
+    )
+    await waitFor(() => expect(result.current.selectedModel).toBe('geo-model'))
+
+    let request!: Promise<boolean>
+    act(() => {
+      request = result.current.ask('Wat staat hier?')
+    })
+    rerender({ projectId: 'project-2' })
+    await act(async () => {
+      pending.resolve(response('antwoord uit project 1'))
+      await request
+    })
+
+    expect(result.current.messages).toEqual([])
+    expect(result.current.loading).toBe(false)
+    expect(result.current.error).toBeNull()
+  })
+
+  it('lets only the newest request update a conversation', async () => {
+    const older = deferred<AssistantQueryResponse>()
+    const newer = deferred<AssistantQueryResponse>()
+    mocks.query
+      .mockReturnValueOnce(older.promise)
+      .mockReturnValueOnce(newer.promise)
+    const { result } = renderHook(() => useGeoAssistant({
+      selectedProjectId: 'project-1',
+      selectedAreaId: null,
+      selectionBbox: null,
+    }))
+    await waitFor(() => expect(result.current.selectedModel).toBe('geo-model'))
+
+    let olderRequest!: Promise<boolean>
+    let newerRequest!: Promise<boolean>
+    act(() => { olderRequest = result.current.ask('Eerste vraag') })
+    act(() => { newerRequest = result.current.ask('Tweede vraag') })
+    await act(async () => {
+      newer.resolve(response('nieuwste antwoord'))
+      await newerRequest
+    })
+    await act(async () => {
+      older.resolve(response('verouderd antwoord'))
+      await olderRequest
+    })
+
+    const assistantMessages = result.current.messages.filter((message) => message.role === 'assistant')
+    expect(assistantMessages.map((message) => message.content)).toEqual(['nieuwste antwoord'])
+    expect(result.current.loading).toBe(false)
+  })
+})

frontend/src/hooks/useGeoAssistant.ts

@@ -1,4 +1,4 @@
-import { useEffect, useMemo, useState } from 'react'
+import { useEffect, useMemo, useRef, useState } from 'react'
 import { formatError } from '../lib/formatError'
 import { assistantApi } from '../services/api/assistant'
 import type {
@@ -36,15 +36,61 @@ function readStoredPreference(): string {
   }
 }
 
+function assistantScopeKey(
+  projectId: string | null,
+  areaId: string | null,
+  bbox: VectorSelectionBBox | null,
+): string {
+  return JSON.stringify([
+    projectId,
+    areaId,
+    bbox?.min_x ?? null,
+    bbox?.min_y ?? null,
+    bbox?.max_x ?? null,
+    bbox?.max_y ?? null,
+    bbox?.crs ?? null,
+  ])
+}
+
+interface AssistantConversationState {
+  scopeKey: string
+  messages: GeoAssistantMessage[]
+}
+
+interface AssistantRequestState {
+  scopeKey: string
+  requestId: number
+  loading: boolean
+  error: string | null
+}
+
 export function useGeoAssistant({ selectedProjectId, selectedAreaId, selectionBbox }: UseGeoAssistantOptions) {
+  const scopeKey = assistantScopeKey(selectedProjectId, selectedAreaId, selectionBbox)
+  const activeScopeRef = useRef(scopeKey)
+  const latestRequestIdRef = useRef(0)
+  if (activeScopeRef.current !== scopeKey) {
+    activeScopeRef.current = scopeKey
+    latestRequestIdRef.current += 1
+  }
+
   const [status, setStatus] = useState<AssistantStatus | null>(null)
   const [models, setModels] = useState<AssistantModelRead[]>([])
   const [selectedModelChoice, setSelectedModelChoice] = useState(readStoredPreference)
   const [defaultModel, setDefaultModel] = useState('')
-  const [messages, setMessages] = useState<GeoAssistantMessage[]>([])
-  const [loading, setLoading] = useState(false)
+  const [conversation, setConversation] = useState<AssistantConversationState>({ scopeKey, messages: [] })
+  const [requestState, setRequestState] = useState<AssistantRequestState>({
+    scopeKey,
+    requestId: 0,
+    loading: false,
+    error: null,
+  })
   const [loadingModels, setLoadingModels] = useState(false)
-  const [error, setError] = useState<string | null>(null)
+  const [modelError, setModelError] = useState<string | null>(null)
+
+  const messages = conversation.scopeKey === scopeKey ? conversation.messages : []
+  const loading = requestState.scopeKey === scopeKey && requestState.loading
+  const queryError = requestState.scopeKey === scopeKey ? requestState.error : null
+  const error = queryError ?? modelError
 
   const selectedModel = useMemo(() => {
     const available = new Set(models.map((model) => model.name))
@@ -62,7 +108,7 @@ export function useGeoAssistant({ selectedProjectId, selectedAreaId, selectionBb
 
   const loadModels = async () => {
     setLoadingModels(true)
-    setError(null)
+    setModelError(null)
     try {
       const currentStatus = await assistantApi.status()
       setStatus(currentStatus)
@@ -82,22 +128,39 @@ export function useGeoAssistant({ selectedProjectId, selectedAreaId, selectionBb
       setStatus(null)
       setModels([])
       setDefaultModel('')
-      setError(formatError(requestError, 'De lokale AI-assistent kon niet worden bereikt.'))
+      setModelError(formatError(requestError, 'De lokale AI-assistent kon niet worden bereikt.'))
     } finally {
       setLoadingModels(false)
     }
   }
 
   useEffect(() => { void loadModels() }, [])
-  useEffect(() => { setMessages([]); setError(null) }, [selectedProjectId])
+  useEffect(() => {
+    setConversation({ scopeKey, messages: [] })
+    setRequestState({
+      scopeKey,
+      requestId: latestRequestIdRef.current,
+      loading: false,
+      error: null,
+    })
+  }, [scopeKey])
 
   const ask = async (question: string): Promise<boolean> => {
     const trimmed = question.trim()
     if (!selectedProjectId || !trimmed || !selectedModel) return false
+    const requestId = latestRequestIdRef.current + 1
+    latestRequestIdRef.current = requestId
+    const requestScopeKey = scopeKey
     const userMessage: GeoAssistantMessage = { id: nextAssistantMessageId('user'), role: 'user', content: trimmed }
-    setMessages((current) => [...current, userMessage])
-    setLoading(true)
-    setError(null)
+    setConversation((current) => ({
+      scopeKey: requestScopeKey,
+      messages: [...(current.scopeKey === requestScopeKey ? current.messages : []), userMessage],
+    }))
+    setRequestState({ scopeKey: requestScopeKey, requestId, loading: true, error: null })
+    const isLatestRequest = () => (
+      latestRequestIdRef.current === requestId
+      && activeScopeRef.current === requestScopeKey
+    )
     try {
       const history = messages.slice(-6).map(({ role, content }) => ({ role, content }))
       const result = await assistantApi.query(selectedProjectId, {
@@ -107,17 +170,40 @@ export function useGeoAssistant({ selectedProjectId, selectedAreaId, selectionBb
         area_id: selectedAreaId,
         history,
       })
-      setMessages((current) => [...current, { id: nextAssistantMessageId('assistant'), role: 'assistant', content: result.answer, response: result }])
+      if (!isLatestRequest()) return false
+      setConversation((current) => current.scopeKey === requestScopeKey ? {
+        scopeKey: requestScopeKey,
+        messages: [...current.messages, { id: nextAssistantMessageId('assistant'), role: 'assistant', content: result.answer, response: result }],
+      } : current)
       return true
     } catch (requestError) {
-      setError(formatError(requestError, 'GeoIntel kon de vraag niet beantwoorden.'))
+      if (!isLatestRequest()) return false
+      setRequestState({
+        scopeKey: requestScopeKey,
+        requestId,
+        loading: false,
+        error: formatError(requestError, 'GeoIntel kon de vraag niet beantwoorden.'),
+      })
       return false
     } finally {
-      setLoading(false)
+      if (isLatestRequest()) {
+        setRequestState((current) => current.scopeKey === requestScopeKey && current.requestId === requestId
+          ? { ...current, loading: false }
+          : current)
+      }
     }
   }
 
-  const clear = () => { setMessages([]); setError(null) }
+  const clear = () => {
+    latestRequestIdRef.current += 1
+    setConversation({ scopeKey, messages: [] })
+    setRequestState({
+      scopeKey,
+      requestId: latestRequestIdRef.current,
+      loading: false,
+      error: null,
+    })
+  }
 
   return { status, models, selectedModel, selectedModelChoice, defaultModel, messages, loading, loadingModels, error, loadModels, ask, clear, setSelectedModel }
-}
+}

frontend/src/hooks/useMapSelectionDataset.ts

@@ -26,7 +26,7 @@ export function useMapSelectionDataset({
 
   const deriveMapSelectionDataset = async (bbox: VectorSelectionBBox, areaId?: string) => {
     if (!selectedProjectId || !selectedDataset || !isVectorDatasetType(selectedDataset.dataset_type)) {
-      setSelectionDatasetError('Select a vector dataset before saving the area as a dataset.')
+      setSelectionDatasetError('Kies eerst een vectorbron om het gebied als bron te bewaren.')
       return null
     }
     setSelectionDatasetSaving(true)
@@ -44,7 +44,7 @@ export function useMapSelectionDataset({
       setMapLayerVisible(true)
       return derived
     } catch (error) {
-      setSelectionDatasetError(formatError(error, 'Failed to save area as dataset'))
+      setSelectionDatasetError(formatError(error, 'Het gebied kon niet als bron worden bewaard'))
       return null
     } finally {
       setSelectionDatasetSaving(false)

frontend/src/hooks/useMapSelectionQa.ts

@@ -24,7 +24,7 @@ export function useMapSelectionQa({
 
   const runMapSelectionQa = async (candidateDataset = latestSelectionDataset) => {
     if (!selectedProjectId) {
-      setMapSelectionQaError('Select a project before running QA/QC.')
+      setMapSelectionQaError('Kies eerst een werkruimte om een kwaliteitscontrole te draaien.')
       return null
     }
     if (!candidateDataset) {
@@ -32,7 +32,7 @@ export function useMapSelectionQa({
       return null
     }
     if (!selectedMapQaReferenceDatasetId) {
-      setMapSelectionQaError('Select a reference dataset for QA/QC.')
+      setMapSelectionQaError('Kies eerst een referentiebron voor de kwaliteitscontrole.')
       return null
     }
     if (candidateDataset.id === selectedMapQaReferenceDatasetId) {

frontend/src/hooks/useMapWorkspaceState.ts

@@ -89,8 +89,8 @@ export function useMapWorkspaceState({
     }
     return 'Geen actieve kaartlaag'
   }, [changeDetectionGeoJson, datasetLayerActive, detectionGeoJson, segmentationGeoJson, selectedDataset])
-  const mapFeatureCount = mapFeatureCollection?.features.length ?? 0
-  const areaFeatureCount = areaFeatureCollection?.features.length ?? 0
+  const mapFeatureCount = mapFeatureCollection?.features?.length ?? 0
+  const areaFeatureCount = areaFeatureCollection?.features?.length ?? 0
 
   useEffect(() => {
     setSelectedMapFeature(null)

frontend/src/hooks/useOperatorSession.ts

@@ -1,6 +1,7 @@
 import { useEffect, useState } from 'react'
 import { formatAuthError } from '../lib/authError'
 import { getAuthSession, logout, type AuthSession } from '../services/api/auth'
+import { vergeetGedeeldeVerzoeken } from '../services/api/client'
 
 const signedOutSession: AuthSession = {
   authentication_required: true,
@@ -53,6 +54,8 @@ export function useOperatorSession() {
     setLoggingOut(true)
     try {
       setSession(await logout())
+      // Geen gedeelde antwoorden meenemen naar de volgende gebruiker.
+      vergeetGedeeldeVerzoeken()
       setSessionError(null)
     } catch (error) {
       setSessionError(formatAuthError(error, 'Uitloggen is niet gelukt. Vernieuw de pagina en probeer opnieuw.'))
@@ -62,6 +65,7 @@ export function useOperatorSession() {
   }
 
   const handleAuthenticated = (authenticatedSession: AuthSession) => {
+    vergeetGedeeldeVerzoeken()
     setSession(authenticatedSession)
     setSessionError(null)
   }

frontend/src/hooks/useProviderCapabilities.ts

@@ -16,7 +16,7 @@ export function useProviderCapabilities() {
       const providerResponse = await externalApi.listProviders()
       setProviderCapabilities(providerResponse.providers)
     } catch (error) {
-      setCapabilitiesError(error instanceof Error ? error.message : 'Failed to load external capabilities')
+      setCapabilitiesError(error instanceof Error ? error.message : 'De bronkoppelingen konden niet worden geladen')
     } finally {
       setLoadingCapabilities(false)
     }

frontend/src/hooks/useQualityWorkflow.ts

@@ -33,13 +33,13 @@ export function useQualityWorkflow({ selectedProjectId, loadProjectData }: Quali
       setQualityChecks(response.items)
       return response.items
     } catch (error) {
-      setQualityChecksError(formatError(error, 'Failed to load QA/QC results'))
+      setQualityChecksError(formatError(error, 'De kwaliteitscontroles konden niet worden geladen'))
     }
   }
 
   const loadQualityEvidenceGeoJson = async (qualityCheckId: string, projectId = selectedProjectId): Promise<QualityEvidenceGeoJsonResponse | null> => {
     if (!projectId) {
-      setQualityEvidenceError('Select a project first')
+      setQualityEvidenceError('Kies eerst een werkruimte')
       return null
     }
     setQualityEvidenceLoading(true)
@@ -49,7 +49,7 @@ export function useQualityWorkflow({ selectedProjectId, loadProjectData }: Quali
       setQualityEvidenceGeoJson(response)
       return response
     } catch (error) {
-      setQualityEvidenceError(formatError(error, 'Failed to load QA/QC evidence overlay'))
+      setQualityEvidenceError(formatError(error, 'De bewijslaag van de kwaliteitscontrole kon niet worden geladen'))
       return null
     } finally {
       setQualityEvidenceLoading(false)
@@ -63,15 +63,15 @@ export function useQualityWorkflow({ selectedProjectId, loadProjectData }: Quali
 
   const runQaComparison = async () => {
     if (!selectedProjectId) {
-      setQaError('Select a project first')
+      setQaError('Kies eerst een werkruimte')
       return
     }
     if (!qaCandidateDatasetId) {
-      setQaError('Select candidate dataset')
+      setQaError('Kies eerst een kandidaatbron')
       return
     }
     if (!qaReferenceDatasetId) {
-      setQaError('Select reference dataset')
+      setQaError('Kies eerst een referentiebron')
       return
     }
     if (qaCandidateDatasetId === qaReferenceDatasetId) {

frontend/src/hooks/useSegmentationWorkflow.test.tsx

@@ -0,0 +1,220 @@
+import { act, renderHook } from '@testing-library/react'
+import { beforeEach, describe, expect, it, vi } from 'vitest'
+import type { JobRead, SegmentationRead, SegmentationRunRead } from '../types'
+
+const mocks = vi.hoisted(() => ({
+  listModels: vi.fn(),
+  runAsync: vi.fn(),
+  listRuns: vi.fn(),
+  getRun: vi.fn(),
+  listSegmentations: vi.fn(),
+  getRunGeoJson: vi.fn(),
+  compareWithReference: vi.fn(),
+}))
+
+vi.mock('../services/api', () => ({
+  segmentationApi: {
+    listModels: mocks.listModels,
+    runAsync: mocks.runAsync,
+    listRuns: mocks.listRuns,
+    getRun: mocks.getRun,
+    listSegmentations: mocks.listSegmentations,
+    getRunGeoJson: mocks.getRunGeoJson,
+    compareWithReference: mocks.compareWithReference,
+  },
+}))
+
+import { useSegmentationWorkflow } from './useSegmentationWorkflow'
+
+const projectId = 'project-1'
+const datasetId = 'dataset-1'
+const jobId = 'job-1'
+const analysisRunId = 'run-1'
+
+const completedJob: JobRead = {
+  id: jobId,
+  job_type: 'segmentation.run',
+  status: 'success',
+  project_id: projectId,
+  dataset_id: datasetId,
+  parameters_json: {},
+  result_json: { analysis_run_id: analysisRunId, segmentation_count: 2 },
+}
+
+const persistedRun: SegmentationRunRead = {
+  id: analysisRunId,
+  project_id: projectId,
+  dataset_id: datasetId,
+  job_id: jobId,
+  analysis_type: 'segmentation',
+  status: 'success',
+  model_name: 'yolo-seg-configured',
+  parameters_json: {},
+  result_json: { segmentation_count: 2 },
+}
+
+function renderWorkflow(selectedProjectId = projectId) {
+  const loadProjectData = vi.fn().mockResolvedValue(undefined)
+  const loadQualityChecks = vi.fn().mockResolvedValue([])
+  const view = renderHook(() => useSegmentationWorkflow({
+    selectedProjectId,
+    rasterDatasets: [],
+    qaIouThreshold: 0.5,
+    loadProjectData,
+    loadQualityChecks,
+  }))
+  return { ...view, loadProjectData }
+}
+
+describe('useSegmentationWorkflow GPU execution', () => {
+  beforeEach(() => {
+    vi.clearAllMocks()
+    mocks.listModels.mockResolvedValue({
+      models: [{
+        model_id: 'yolo-seg-configured',
+        display_name: 'YOLO segmentatie',
+        framework: 'ultralytics/pytorch',
+        task_type: 'segmentation',
+        supported_classes: ['building'],
+        configured: true,
+        status: 'configured',
+        limitation_message: '',
+        operator_review_required: true,
+      }],
+    })
+    mocks.runAsync.mockResolvedValue(completedJob)
+    mocks.listRuns.mockResolvedValue({ items: [persistedRun], total: 1 })
+    mocks.getRun.mockResolvedValue(persistedRun)
+    mocks.listSegmentations.mockResolvedValue({ items: [], total: 0, truncated: false })
+    mocks.getRunGeoJson.mockResolvedValue({ type: 'FeatureCollection', features: [] })
+  })
+
+  it('queues, follows and reconciles a persisted segmentation result', async () => {
+    const { result, loadProjectData } = renderWorkflow()
+    await act(async () => { await result.current.loadSegmentationModels() })
+    act(() => {
+      result.current.setSelectedSegmentationDatasetId(datasetId)
+      result.current.setSegmentationTileManifestPath('/tiles/manifest.json')
+    })
+
+    await act(async () => { await result.current.runSegmentation() })
+
+    expect(mocks.runAsync).toHaveBeenCalledWith(expect.objectContaining({
+      project_id: projectId,
+      dataset_id: datasetId,
+      model_id: 'yolo-seg-configured',
+      tile_manifest_path: '/tiles/manifest.json',
+    }))
+    expect(mocks.getRun).toHaveBeenCalledWith(analysisRunId, projectId)
+    expect(result.current.segmentationRunResult).toMatchObject({
+      analysis_run_id: analysisRunId,
+      job_id: jobId,
+      segmentation_count: 2,
+      status: 'success',
+    })
+    expect(result.current.segmentationRunError).toBeNull()
+    expect(result.current.segmentationTotal).toBe(0)
+    expect(result.current.segmentationTruncated).toBe(false)
+    expect(loadProjectData).toHaveBeenCalledWith(projectId)
+  })
+
+  it('does not queue a configured model without a tile manifest', async () => {
+    const { result } = renderWorkflow()
+    await act(async () => { await result.current.loadSegmentationModels() })
+    act(() => { result.current.setSelectedSegmentationDatasetId(datasetId) })
+
+    await act(async () => { await result.current.runSegmentation() })
+
+    expect(mocks.runAsync).not.toHaveBeenCalled()
+    expect(result.current.segmentationRunError).toContain('beeldtegelmanifest')
+  })
+
+  it('ignores a late run list after the active project changes', async () => {
+    let resolveOlder!: (value: { items: SegmentationRunRead[]; total: number }) => void
+    let resolveNewer!: (value: { items: SegmentationRunRead[]; total: number }) => void
+    mocks.listRuns
+      .mockReturnValueOnce(new Promise((resolve) => { resolveOlder = resolve }))
+      .mockReturnValueOnce(new Promise((resolve) => { resolveNewer = resolve }))
+    const loadProjectData = vi.fn().mockResolvedValue(undefined)
+    const loadQualityChecks = vi.fn().mockResolvedValue([])
+    const { result, rerender } = renderHook(
+      ({ selectedProjectId }) => useSegmentationWorkflow({
+        selectedProjectId,
+        rasterDatasets: [],
+        qaIouThreshold: 0.5,
+        loadProjectData,
+        loadQualityChecks,
+      }),
+      { initialProps: { selectedProjectId: 'project-1' } },
+    )
+
+    let olderRequest!: Promise<void>
+    let newerRequest!: Promise<void>
+    act(() => { olderRequest = result.current.loadSegmentationRuns('project-1') })
+    rerender({ selectedProjectId: 'project-2' })
+    act(() => { newerRequest = result.current.loadSegmentationRuns('project-2') })
+    const projectTwoRun = { ...persistedRun, id: 'run-2', project_id: 'project-2' }
+    await act(async () => {
+      resolveNewer({ items: [projectTwoRun], total: 1 })
+      await newerRequest
+    })
+    await act(async () => {
+      resolveOlder({ items: [persistedRun], total: 1 })
+      await olderRequest
+    })
+
+    expect(result.current.segmentationRuns).toEqual([projectTwoRun])
+    expect(result.current.selectedSegmentationRunId).toBe('run-2')
+  })
+
+  it('ignores late polygons from another project and clears an empty selection loader', async () => {
+    let resolveOlderList!: (value: { items: SegmentationRead[]; total: number }) => void
+    let resolveNewerList!: (value: { items: SegmentationRead[]; total: number }) => void
+    let resolveOlderGeo!: (value: GeoJSON.FeatureCollection) => void
+    let resolveNewerGeo!: (value: GeoJSON.FeatureCollection) => void
+    mocks.listSegmentations
+      .mockReturnValueOnce(new Promise((resolve) => { resolveOlderList = resolve }))
+      .mockReturnValueOnce(new Promise((resolve) => { resolveNewerList = resolve }))
+    mocks.getRunGeoJson
+      .mockReturnValueOnce(new Promise((resolve) => { resolveOlderGeo = resolve }))
+      .mockReturnValueOnce(new Promise((resolve) => { resolveNewerGeo = resolve }))
+    const loadProjectData = vi.fn().mockResolvedValue(undefined)
+    const loadQualityChecks = vi.fn().mockResolvedValue([])
+    const { result, rerender } = renderHook(
+      ({ selectedProjectId }) => useSegmentationWorkflow({
+        selectedProjectId,
+        rasterDatasets: [],
+        qaIouThreshold: 0.5,
+        loadProjectData,
+        loadQualityChecks,
+      }),
+      { initialProps: { selectedProjectId: 'project-1' } },
+    )
+    const oldItem: SegmentationRead = {
+      id: 'segment-1', project_id: 'project-1', analysis_run_id: 'run-1', model_name: 'model', class_name: 'building',
+    }
+    const newItem: SegmentationRead = {
+      id: 'segment-2', project_id: 'project-2', analysis_run_id: 'run-2', model_name: 'model', class_name: 'building',
+    }
+    let olderRequest!: Promise<void>
+    let newerRequest!: Promise<void>
+    act(() => { olderRequest = result.current.loadSegmentationResults('run-1') })
+    rerender({ selectedProjectId: 'project-2' })
+    act(() => { newerRequest = result.current.loadSegmentationResults('run-2') })
+    await act(async () => {
+      resolveNewerList({ items: [newItem], total: 1 })
+      resolveNewerGeo({ type: 'FeatureCollection', features: [] })
+      await newerRequest
+    })
+    await act(async () => {
+      resolveOlderList({ items: [oldItem], total: 1 })
+      resolveOlderGeo({ type: 'FeatureCollection', features: [] })
+      await olderRequest
+    })
+
+    expect(result.current.segmentationItems).toEqual([newItem])
+    await act(async () => { await result.current.loadSegmentationResults('') })
+    expect(result.current.loadingSegmentationResults).toBe(false)
+    expect(result.current.segmentationItems).toEqual([])
+  })
+})

frontend/src/hooks/useSegmentationWorkflow.ts

@@ -1,7 +1,8 @@
-import { useMemo, useState } from 'react'
+import { useEffect, useMemo, useRef, useState } from 'react'
 import { segmentationApi } from '../services/api'
 import type {
   DatasetCreateResponse,
+  JobRead,
   QualityCheckRead,
   SegmentationModelCapability,
   SegmentationQaResult,
@@ -10,6 +11,12 @@ import type {
   SegmentationRunResponse,
 } from '../types'
 import { formatError } from '../lib/formatError'
+import {
+  analysisRunIdFromSegmentationJob,
+  completedSegmentationResponse,
+  SegmentationJobError,
+  waitForSegmentationJob,
+} from '../services/segmentationJob'
 
 interface SegmentationWorkflowOptions {
   selectedProjectId: string | null
@@ -19,6 +26,16 @@ interface SegmentationWorkflowOptions {
   loadQualityChecks: (projectId?: string | null) => Promise<QualityCheckRead[] | void>
 }
 
+function isAbortError(error: unknown): boolean {
+  return error instanceof Error && error.name === 'AbortError'
+}
+
+function abortedError(): Error {
+  const error = new Error('Het volgen van de segmentatietaak is gestopt')
+  error.name = 'AbortError'
+  return error
+}
+
 export function useSegmentationWorkflow({
   selectedProjectId,
   rasterDatasets,
@@ -34,11 +51,14 @@ export function useSegmentationWorkflow({
   const [segmentationTileManifestPath, setSegmentationTileManifestPath] = useState('')
   const [segmentationConfidenceThreshold, setSegmentationConfidenceThreshold] = useState(0.5)
   const [runningSegmentation, setRunningSegmentation] = useState(false)
+  const [segmentationJob, setSegmentationJob] = useState<JobRead | null>(null)
   const [segmentationRunResult, setSegmentationRunResult] = useState<SegmentationRunResponse | null>(null)
   const [segmentationRunError, setSegmentationRunError] = useState<string | null>(null)
   const [segmentationRuns, setSegmentationRuns] = useState<SegmentationRunRead[]>([])
   const [selectedSegmentationRunId, setSelectedSegmentationRunId] = useState('')
   const [segmentationItems, setSegmentationItems] = useState<SegmentationRead[]>([])
+  const [segmentationTotal, setSegmentationTotal] = useState(0)
+  const [segmentationTruncated, setSegmentationTruncated] = useState(false)
   const [segmentationGeoJson, setSegmentationGeoJson] = useState<GeoJSON.FeatureCollection | null>(null)
   const [segmentationClassFilter, setSegmentationClassFilter] = useState('')
   const [segmentationMinConfidenceFilter, setSegmentationMinConfidenceFilter] = useState(0)
@@ -47,6 +67,41 @@ export function useSegmentationWorkflow({
   const [segmentationQaResult, setSegmentationQaResult] = useState<SegmentationQaResult | null>(null)
   const [segmentationQaError, setSegmentationQaError] = useState<string | null>(null)
   const [runningSegmentationQa, setRunningSegmentationQa] = useState(false)
+  const activeSegmentationControllerRef = useRef<AbortController | null>(null)
+  const selectedProjectIdRef = useRef(selectedProjectId)
+  const segmentationExecutionSequence = useRef(0)
+  const segmentationRunsRequestSequence = useRef(0)
+  const segmentationResultsRequestSequence = useRef(0)
+  const segmentationQaRequestSequence = useRef(0)
+  selectedProjectIdRef.current = selectedProjectId
+
+  useEffect(() => {
+    activeSegmentationControllerRef.current?.abort()
+    activeSegmentationControllerRef.current = null
+    segmentationExecutionSequence.current += 1
+    segmentationRunsRequestSequence.current += 1
+    segmentationResultsRequestSequence.current += 1
+    segmentationQaRequestSequence.current += 1
+    setSelectedSegmentationDatasetId('')
+    setSegmentationRuns([])
+    setSelectedSegmentationRunId('')
+    setSegmentationItems([])
+    setSegmentationTotal(0)
+    setSegmentationTruncated(false)
+    setSegmentationGeoJson(null)
+    setSegmentationRunResult(null)
+    setSegmentationRunError(null)
+    setSegmentationJob(null)
+    setRunningSegmentation(false)
+    setLoadingSegmentationResults(false)
+    setSegmentationTileManifestPath('')
+    setSegmentationQaResult(null)
+    setSegmentationQaError(null)
+    setRunningSegmentationQa(false)
+    return () => {
+      activeSegmentationControllerRef.current?.abort()
+    }
+  }, [selectedProjectId])
 
   const selectedSegmentationModel = useMemo(
     () => segmentationModels.find((model) => model.model_id === selectedSegmentationModelId) ?? null,
@@ -72,39 +127,61 @@ export function useSegmentationWorkflow({
         )
       }
     } catch (error) {
-      setSegmentationModelError(formatError(error, 'Failed to load segmentation models'))
+      setSegmentationModelError(formatError(error, 'De segmentatiemodellen konden niet worden geladen'))
     } finally {
       setLoadingSegmentationModels(false)
     }
   }
 
   const loadSegmentationRuns = async (projectId = selectedProjectId) => {
+    const sequence = segmentationRunsRequestSequence.current + 1
+    segmentationRunsRequestSequence.current = sequence
     if (!projectId) {
       setSegmentationRuns([])
+      setSelectedSegmentationRunId('')
       return
     }
     try {
       const response = await segmentationApi.listRuns({ project_id: projectId })
+      if (
+        segmentationRunsRequestSequence.current !== sequence
+        || selectedProjectIdRef.current !== projectId
+      ) return
       setSegmentationRuns(response.items)
-      if (!selectedSegmentationRunId && response.items.length > 0) {
-        setSelectedSegmentationRunId(response.items[0].id)
-      }
+      setSelectedSegmentationRunId((current) => (
+        response.items.some((run) => run.id === current) ? current : response.items[0]?.id ?? ''
+      ))
     } catch (error) {
-      setSegmentationRunError(formatError(error, 'Failed to load segmentation runs'))
+      if (
+        segmentationRunsRequestSequence.current === sequence
+        && selectedProjectIdRef.current === projectId
+      ) {
+        setSegmentationRunError(formatError(error, 'De segmentatieruns konden niet worden geladen'))
+      }
     }
   }
 
   const loadSegmentationResults = async (analysisRunId = selectedSegmentationRunId) => {
-    if (!analysisRunId) {
+    const sequence = segmentationResultsRequestSequence.current + 1
+    segmentationResultsRequestSequence.current = sequence
+    const requestProjectId = selectedProjectIdRef.current
+    if (!analysisRunId || !requestProjectId) {
       setSegmentationItems([])
+      setSegmentationTotal(0)
+      setSegmentationTruncated(false)
       setSegmentationGeoJson(null)
+      setLoadingSegmentationResults(false)
       return
     }
     setLoadingSegmentationResults(true)
     setSegmentationRunError(null)
+    setSegmentationItems([])
+    setSegmentationTotal(0)
+    setSegmentationTruncated(false)
+    setSegmentationGeoJson(null)
     try {
       const params = {
-        project_id: selectedProjectId ?? '',
+        project_id: requestProjectId,
         class_name: segmentationClassFilter || null,
         min_confidence: segmentationMinConfidenceFilter > 0 ? segmentationMinConfidenceFilter : null,
       }
@@ -112,93 +189,230 @@ export function useSegmentationWorkflow({
         segmentationApi.listSegmentations(analysisRunId, params),
         segmentationApi.getRunGeoJson(analysisRunId, params),
       ])
+      if (
+        segmentationResultsRequestSequence.current !== sequence
+        || selectedProjectIdRef.current !== requestProjectId
+      ) return
+      if (segmentationsResponse.items.some((item) => (
+        item.project_id !== requestProjectId || item.analysis_run_id !== analysisRunId
+      ))) {
+        throw new Error('De server retourneerde segmentaties uit een andere werkruimte of analyserun')
+      }
       setSegmentationItems(segmentationsResponse.items)
+      setSegmentationTotal(segmentationsResponse.total)
+      setSegmentationTruncated(Boolean(segmentationsResponse.truncated))
       setSegmentationGeoJson(geoJsonResponse)
     } catch (error) {
-      setSegmentationRunError(formatError(error, 'Failed to load segmentation results'))
+      if (
+        segmentationResultsRequestSequence.current === sequence
+        && selectedProjectIdRef.current === requestProjectId
+      ) {
+        setSegmentationRunError(formatError(error, 'De segmentatieresultaten konden niet worden geladen'))
+      }
     } finally {
-      setLoadingSegmentationResults(false)
+      if (
+        segmentationResultsRequestSequence.current === sequence
+        && selectedProjectIdRef.current === requestProjectId
+      ) {
+        setLoadingSegmentationResults(false)
+      }
     }
   }
 
   const runSegmentation = async () => {
     if (!selectedProjectId) {
-      setSegmentationRunError('Select a project first')
+      setSegmentationRunError('Kies eerst een werkruimte')
       return
     }
     const datasetId = selectedSegmentationDatasetId || rasterDatasets[0]?.id
     if (!datasetId) {
-      setSegmentationRunError('Select a raster dataset')
+      setSegmentationRunError('Kies eerst een rasterbron')
       return
     }
     if (!selectedSegmentationModel?.configured) {
-      setSegmentationRunError('Selected segmentation model is not configured')
+      setSegmentationRunError('Het gekozen segmentatiemodel is niet geconfigureerd')
       return
     }
+    if (selectedSegmentationModelId === 'fixture-segmenter') {
+      setSegmentationRunError('Het fixturemodel is uitsluitend beschikbaar voor expliciete geautomatiseerde tests')
+      return
+    }
+    if (!segmentationTileManifestPath.trim()) {
+      setSegmentationRunError('Koppel eerst het beeldtegelmanifest van het gekozen rasterbestand')
+      return
+    }
+    if (
+      (activeSegmentationControllerRef.current && !activeSegmentationControllerRef.current.signal.aborted)
+      || segmentationJob?.status === 'queued'
+      || segmentationJob?.status === 'running'
+    ) {
+      setSegmentationRunError('Er wordt al een GPU-segmentatietaak verwerkt. Wacht tot die taak klaar is.')
+      return
+    }
+
+    const projectId = selectedProjectId
+    const parameters: Record<string, unknown> = {}
+    const request = {
+      project_id: projectId,
+      dataset_id: datasetId,
+      model_id: selectedSegmentationModelId,
+      confidence_threshold: segmentationConfidenceThreshold,
+      tile_manifest_path: segmentationTileManifestPath.trim() || null,
+      parameters_json: parameters,
+    }
+    const controller = new AbortController()
+    const executionSequence = segmentationExecutionSequence.current + 1
+    segmentationExecutionSequence.current = executionSequence
+    activeSegmentationControllerRef.current = controller
+    const assertExecutionCurrent = () => {
+      if (
+        controller.signal.aborted
+        || segmentationExecutionSequence.current !== executionSequence
+        || selectedProjectIdRef.current !== projectId
+      ) {
+        throw abortedError()
+      }
+    }
+
     setSegmentationRunError(null)
     setSegmentationRunResult(null)
     setRunningSegmentation(true)
+    setSegmentationJob(null)
     try {
-      const parameters =
-        selectedSegmentationModelId === 'fixture-segmenter'
-          ? { fixture_mode: true, fixture_segmentations: [] }
-          : {}
-      const result = await segmentationApi.run({
-        project_id: selectedProjectId,
-        dataset_id: datasetId,
-        model_id: selectedSegmentationModelId,
-        confidence_threshold: segmentationConfidenceThreshold,
-        tile_manifest_path: segmentationTileManifestPath.trim() || null,
-        parameters_json: parameters,
+      const queuedJob = await segmentationApi.runAsync(request)
+      assertExecutionCurrent()
+      setSegmentationJob(queuedJob)
+      const completedJob = await waitForSegmentationJob({
+        projectId,
+        initialJob: queuedJob,
+        signal: controller.signal,
+        onStatus: (job) => {
+          if (
+            segmentationExecutionSequence.current === executionSequence
+            && selectedProjectIdRef.current === projectId
+          ) {
+            setSegmentationJob(job)
+          }
+        },
       })
+      assertExecutionCurrent()
+      const explicitAnalysisRunId = analysisRunIdFromSegmentationJob(completedJob)
+      const run = explicitAnalysisRunId
+        ? await segmentationApi.getRun(explicitAnalysisRunId, projectId)
+        : (await segmentationApi.listRuns({ project_id: projectId, dataset_id: datasetId })).items
+            .find((candidate) => candidate.job_id === completedJob.id)
+      assertExecutionCurrent()
+      if (!run) {
+        throw new SegmentationJobError(
+          'De GPU-taak is voltooid, maar de bijbehorende bewaarde segmentatierun ontbreekt.',
+          'SEGMENTATION_RUN_RESULT_NOT_FOUND',
+          completedJob.id,
+        )
+      }
+      const result = completedSegmentationResponse(request, completedJob, run)
+      setSegmentationRunError(null)
       setSegmentationRunResult(result)
       setSelectedSegmentationRunId(result.analysis_run_id)
-      await loadSegmentationRuns(selectedProjectId)
+      await loadSegmentationRuns(projectId)
+      assertExecutionCurrent()
       await loadSegmentationResults(result.analysis_run_id)
-      await loadProjectData(selectedProjectId)
+      assertExecutionCurrent()
+      await loadProjectData(projectId)
     } catch (error) {
-      setSegmentationRunError(formatError(error, 'Segmentation run failed'))
+      if (
+        !isAbortError(error)
+        && segmentationExecutionSequence.current === executionSequence
+        && selectedProjectIdRef.current === projectId
+      ) {
+        setSegmentationRunError(formatError(error, 'De segmentatie is mislukt'))
+      }
     } finally {
-      setRunningSegmentation(false)
+      if (activeSegmentationControllerRef.current === controller) {
+        activeSegmentationControllerRef.current = null
+      }
+      if (
+        segmentationExecutionSequence.current === executionSequence
+        && selectedProjectIdRef.current === projectId
+      ) {
+        setRunningSegmentation(false)
+      }
     }
   }
 
   const runSegmentationQa = async () => {
     if (!selectedSegmentationRunId) {
-      setSegmentationQaError('Select a segmentation run')
+      setSegmentationQaError('Kies eerst een segmentatierun')
       return
     }
     if (!segmentationReferenceDatasetId) {
-      setSegmentationQaError('Select a reference dataset')
+      setSegmentationQaError('Kies eerst een referentiebron')
       return
     }
+    const projectId = selectedProjectIdRef.current
+    if (!projectId) {
+      setSegmentationQaError('Kies eerst een werkruimte')
+      return
+    }
+    const analysisRunId = selectedSegmentationRunId
+    const referenceDatasetId = segmentationReferenceDatasetId
+    const sequence = segmentationQaRequestSequence.current + 1
+    segmentationQaRequestSequence.current = sequence
     setSegmentationQaError(null)
     setSegmentationQaResult(null)
     setRunningSegmentationQa(true)
     try {
-      const result = await segmentationApi.compareWithReference(selectedSegmentationRunId, selectedProjectId!, {
-        reference_dataset_id: segmentationReferenceDatasetId,
+      const result = await segmentationApi.compareWithReference(analysisRunId, projectId, {
+        reference_dataset_id: referenceDatasetId,
         iou_threshold: qaIouThreshold,
         class_name: segmentationClassFilter || null,
         min_confidence: segmentationMinConfidenceFilter > 0 ? segmentationMinConfidenceFilter : null,
       })
+      if (
+        segmentationQaRequestSequence.current !== sequence
+        || selectedProjectIdRef.current !== projectId
+      ) return
       setSegmentationQaResult(result)
-      await loadQualityChecks(selectedProjectId)
+      await loadQualityChecks(projectId)
     } catch (error) {
-      setSegmentationQaError(formatError(error, 'Segmentation QA failed'))
+      if (
+        segmentationQaRequestSequence.current === sequence
+        && selectedProjectIdRef.current === projectId
+      ) {
+        setSegmentationQaError(formatError(error, 'De segmentatiecontrole is mislukt'))
+      }
     } finally {
-      setRunningSegmentationQa(false)
+      if (
+        segmentationQaRequestSequence.current === sequence
+        && selectedProjectIdRef.current === projectId
+      ) {
+        setRunningSegmentationQa(false)
+      }
     }
   }
 
   const resetSegmentationForProject = () => {
+    activeSegmentationControllerRef.current?.abort()
+    activeSegmentationControllerRef.current = null
+    segmentationExecutionSequence.current += 1
+    segmentationRunsRequestSequence.current += 1
+    segmentationResultsRequestSequence.current += 1
+    segmentationQaRequestSequence.current += 1
     setSelectedSegmentationDatasetId('')
     setSegmentationRuns([])
     setSelectedSegmentationRunId('')
     setSegmentationItems([])
+    setSegmentationTotal(0)
+    setSegmentationTruncated(false)
     setSegmentationGeoJson(null)
     setSegmentationRunResult(null)
+    setSegmentationRunError(null)
+    setSegmentationJob(null)
+    setRunningSegmentation(false)
+    setLoadingSegmentationResults(false)
     setSegmentationTileManifestPath('')
+    setSegmentationQaResult(null)
+    setSegmentationQaError(null)
+    setRunningSegmentationQa(false)
   }
 
   return {
@@ -211,11 +425,14 @@ export function useSegmentationWorkflow({
     segmentationTileManifestPath,
     segmentationConfidenceThreshold,
     runningSegmentation,
+    segmentationJob,
     segmentationRunResult,
     segmentationRunError,
     segmentationRuns,
     selectedSegmentationRunId,
     segmentationItems,
+    segmentationTotal,
+    segmentationTruncated,
     segmentationGeoJson,
     segmentationClassFilter,
     segmentationMinConfidenceFilter,

frontend/src/hooks/useTemporalComparison.test.tsx

@@ -69,4 +69,34 @@ describe('useTemporalComparison', () => {
       preview_limit: 500,
     })
   })
+
+  it('keeps a newer comparison when an older request finishes last', async () => {
+    const resolvers: Array<(value: TemporalComparisonResponse) => void> = []
+    mocks.compare.mockImplementation(() => new Promise<TemporalComparisonResponse>((resolve) => {
+      resolvers.push(resolve)
+    }))
+    const older = { earlier_dataset_id: 'older' } as unknown as TemporalComparisonResponse
+    const newer = { earlier_dataset_id: 'newer' } as unknown as TemporalComparisonResponse
+    const { result } = renderHook(() => useTemporalComparison('project-1'))
+
+    let olderRequest: Promise<TemporalComparisonResponse | null>
+    let newerRequest: Promise<TemporalComparisonResponse | null>
+    await act(async () => {
+      olderRequest = result.current.compareTemporalSnapshots('older', 'later', bbox)
+      newerRequest = result.current.compareTemporalSnapshots('newer', 'later', bbox)
+      await Promise.resolve()
+    })
+    await act(async () => {
+      resolvers[1](newer)
+      await newerRequest!
+    })
+    expect(result.current.temporalComparison).toEqual(newer)
+
+    await act(async () => {
+      resolvers[0](older)
+      await olderRequest!
+    })
+    expect(result.current.temporalComparison).toEqual(newer)
+    expect(result.current.temporalComparisonLoading).toBe(false)
+  })
 })

frontend/src/hooks/useTemporalComparison.ts

@@ -1,4 +1,4 @@
-import { useEffect, useState } from 'react'
+import { useEffect, useRef, useState } from 'react'
 import { formatError } from '../lib/formatError'
 import { temporalApi } from '../services/api/temporal'
 import type { TemporalComparisonResponse, VectorSelectionBBox } from '../types'
@@ -7,15 +7,20 @@ export function useTemporalComparison(selectedProjectId: string | null) {
   const [temporalComparison, setTemporalComparison] = useState<TemporalComparisonResponse | null>(null)
   const [temporalComparisonLoading, setTemporalComparisonLoading] = useState(false)
   const [temporalComparisonError, setTemporalComparisonError] = useState<string | null>(null)
+  const requestSequence = useRef(0)
 
   useEffect(() => {
+    requestSequence.current += 1
     setTemporalComparison(null)
     setTemporalComparisonError(null)
+    setTemporalComparisonLoading(false)
   }, [selectedProjectId])
 
   const clearTemporalComparison = () => {
+    requestSequence.current += 1
     setTemporalComparison(null)
     setTemporalComparisonError(null)
+    setTemporalComparisonLoading(false)
   }
 
   const compareTemporalSnapshots = async (
@@ -24,6 +29,8 @@ export function useTemporalComparison(selectedProjectId: string | null) {
     bbox: VectorSelectionBBox,
     areaId?: string,
   ): Promise<TemporalComparisonResponse | null> => {
+    const sequence = requestSequence.current + 1
+    requestSequence.current = sequence
     if (!selectedProjectId) {
       setTemporalComparisonError('Open eerst een project om evoluties te vergelijken.')
       return null
@@ -43,14 +50,20 @@ export function useTemporalComparison(selectedProjectId: string | null) {
         area_id: areaId || null,
         preview_limit: 500,
       })
-      setTemporalComparison(result)
+      if (requestSequence.current === sequence) {
+        setTemporalComparison(result)
+      }
       return result
     } catch (error) {
-      setTemporalComparison(null)
-      setTemporalComparisonError(formatError(error, 'De evolutieanalyse is mislukt.'))
+      if (requestSequence.current === sequence) {
+        setTemporalComparison(null)
+        setTemporalComparisonError(formatError(error, 'De evolutieanalyse is mislukt.'))
+      }
       return null
     } finally {
-      setTemporalComparisonLoading(false)
+      if (requestSequence.current === sequence) {
+        setTemporalComparisonLoading(false)
+      }
     }
   }
 

frontend/src/hooks/useWorkbenchBootstrap.test.tsx

@@ -7,8 +7,9 @@ function action() {
   return vi.fn().mockResolvedValue(undefined)
 }
 
-function options(selectedProjectId: string | null) {
+function options(selectedProjectId: string | null, activeWorkspace = 'map') {
   return {
+    activeWorkspace,
     selectedProjectId,
     selectedDetectionRunId: '',
     detectionClassFilter: '',
@@ -36,20 +37,17 @@ function options(selectedProjectId: string | null) {
 }
 
 describe('useWorkbenchBootstrap', () => {
-  it('loads global capabilities and clears project-owned state without a project', async () => {
+  it('haalt zonder project alleen de werkruimtes op en wist projectgebonden state', async () => {
     const state = options(null)
     renderHook(() => useWorkbenchBootstrap(state))
 
     await waitFor(() => expect(state.loadProjects).toHaveBeenCalledOnce())
-    expect(state.loadCapabilities).toHaveBeenCalledOnce()
-    expect(state.loadDetectionModels).toHaveBeenCalledOnce()
-    expect(state.loadSegmentationModels).toHaveBeenCalledOnce()
     expect(state.resetProjectData).toHaveBeenCalledOnce()
     expect(state.resetDatasetForProject).toHaveBeenCalledOnce()
     expect(state.loadProjectData).not.toHaveBeenCalled()
   })
 
-  it('resets stale state before loading every project-owned collection', async () => {
+  it('laadt op het kaartwerkblad de gebieden en bronnen, en verder niets', async () => {
     const state = options('project-1')
     renderHook(() => useWorkbenchBootstrap(state))
 
@@ -59,25 +57,82 @@ describe('useWorkbenchBootstrap', () => {
     expect(state.resetDetectionForProject).toHaveBeenCalledOnce()
     expect(state.resetSegmentationForProject).toHaveBeenCalledOnce()
     expect(state.resetExportsForProject).toHaveBeenCalledOnce()
-    expect(state.loadDetectionRuns).toHaveBeenCalledWith('project-1')
-    expect(state.loadSegmentationRuns).toHaveBeenCalledWith('project-1')
-    expect(state.loadQualityChecks).toHaveBeenCalledWith('project-1')
-    expect(state.loadExports).toHaveBeenCalledWith('project-1')
+
+    // Alles wat bij een ander werkblad hoort blijft liggen tot dat werkblad
+    // geopend wordt. Voorheen ging dit alles bij het opstarten de deur uit,
+    // ook voor werkbladen die de gebruiker nooit opende.
+    expect(state.loadCapabilities).not.toHaveBeenCalled()
+    expect(state.loadDetectionModels).not.toHaveBeenCalled()
+    expect(state.loadSegmentationModels).not.toHaveBeenCalled()
+    expect(state.loadDetectionRuns).not.toHaveBeenCalled()
+    expect(state.loadSegmentationRuns).not.toHaveBeenCalled()
+    expect(state.loadQualityChecks).not.toHaveBeenCalled()
+    expect(state.loadExports).not.toHaveBeenCalled()
   })
 
-  it('loads the same analysis catalog and project results for a guest', async () => {
-    const state = { ...options('project-1'), restrictedMode: true }
+  it('haalt de beeldanalysegegevens op zodra dat werkblad open staat', async () => {
+    const state = options('project-1', 'ai')
     renderHook(() => useWorkbenchBootstrap(state))
 
-    await waitFor(() => expect(state.loadProjectData).toHaveBeenCalledWith('project-1'))
-    expect(state.loadCapabilities).toHaveBeenCalledOnce()
-    expect(state.loadQualityChecks).toHaveBeenCalledWith('project-1')
-    expect(state.loadDetectionModels).toHaveBeenCalledOnce()
+    await waitFor(() => expect(state.loadDetectionModels).toHaveBeenCalledOnce())
     expect(state.loadSegmentationModels).toHaveBeenCalledOnce()
     expect(state.loadDetectionRuns).toHaveBeenCalledWith('project-1')
     expect(state.loadSegmentationRuns).toHaveBeenCalledWith('project-1')
-    expect(state.loadExports).toHaveBeenCalledWith('project-1')
     expect(state.loadDetectionResults).toHaveBeenCalledOnce()
     expect(state.loadSegmentationResults).toHaveBeenCalledOnce()
+    expect(state.loadExports).not.toHaveBeenCalled()
+  })
+
+  it('haalt kwaliteit, downloads en bronkoppelingen op hun eigen werkblad', async () => {
+    const kwaliteit = options('project-1', 'analysis')
+    renderHook(() => useWorkbenchBootstrap(kwaliteit))
+    await waitFor(() => expect(kwaliteit.loadQualityChecks).toHaveBeenCalledWith('project-1'))
+
+    const downloads = options('project-1', 'exports')
+    renderHook(() => useWorkbenchBootstrap(downloads))
+    await waitFor(() => expect(downloads.loadExports).toHaveBeenCalledWith('project-1'))
+
+    const systeem = options('project-1', 'system')
+    renderHook(() => useWorkbenchBootstrap(systeem))
+    await waitFor(() => expect(systeem.loadCapabilities).toHaveBeenCalledOnce())
+  })
+
+  it('herlaadt bezochte werkbladen niet wanneer een ander werkblad opent', async () => {
+    const state = options('project-1', 'ai')
+    const { rerender } = renderHook((props: { werkblad: string }) =>
+      useWorkbenchBootstrap({ ...state, activeWorkspace: props.werkblad }), {
+      initialProps: { werkblad: 'ai' },
+    })
+    await waitFor(() => expect(state.loadDetectionRuns).toHaveBeenCalledWith('project-1'))
+    const detectionRunCalls = state.loadDetectionRuns.mock.calls.length
+    const detectionResultCalls = state.loadDetectionResults.mock.calls.length
+
+    rerender({ werkblad: 'map' })
+    rerender({ werkblad: 'exports' })
+    await waitFor(() => expect(state.loadExports).toHaveBeenCalledOnce())
+    rerender({ werkblad: 'analysis' })
+    await waitFor(() => expect(state.loadQualityChecks).toHaveBeenCalledOnce())
+
+    expect(state.loadDetectionRuns).toHaveBeenCalledTimes(detectionRunCalls)
+    expect(state.loadDetectionResults).toHaveBeenCalledTimes(detectionResultCalls)
+    expect(state.loadExports).toHaveBeenCalledOnce()
+  })
+
+  it('meldt een mislukte laadactie in plaats van haar weg te slikken', async () => {
+    const state = options('project-1')
+    state.loadProjectData = vi.fn().mockRejectedValue(new Error('netwerk weg'))
+    const gemeld: string[] = []
+    renderHook(() => useWorkbenchBootstrap({ ...state, onLoadError: (onderdeel) => gemeld.push(onderdeel) }))
+
+    await waitFor(() => expect(gemeld).toContain('gebieden en bronnen'))
+  })
+
+  it('laadt voor een gast hetzelfde als voor een operator', async () => {
+    const state = { ...options('project-1', 'ai'), restrictedMode: true }
+    renderHook(() => useWorkbenchBootstrap(state))
+
+    await waitFor(() => expect(state.loadProjectData).toHaveBeenCalledWith('project-1'))
+    expect(state.loadDetectionModels).toHaveBeenCalledOnce()
+    expect(state.loadDetectionRuns).toHaveBeenCalledWith('project-1')
   })
 })

frontend/src/hooks/useWorkbenchBootstrap.ts

@@ -1,10 +1,15 @@
-import { useEffect } from 'react'
+import { useEffect, useRef } from 'react'
 
 type AsyncAction = () => Promise<unknown>
 type ProjectAction = (projectId: string) => Promise<unknown>
 
 interface WorkbenchBootstrapOptions {
   restrictedMode?: boolean
+  /** Het werkblad dat nu open staat. Bepaalt wat er geladen mag worden. */
+  activeWorkspace?: string
+  /** Meldt een mislukte laadactie, zodat de gebruiker het verschil ziet tussen
+      "er is niets" en "het is niet gelukt". */
+  onLoadError?: (onderdeel: string, fout: unknown) => void
   selectedProjectId: string | null
   selectedDetectionRunId: string
   detectionClassFilter: string
@@ -32,6 +37,8 @@ interface WorkbenchBootstrapOptions {
 
 export function useWorkbenchBootstrap({
   restrictedMode = false,
+  activeWorkspace = 'map',
+  onLoadError,
   selectedProjectId,
   selectedDetectionRunId,
   detectionClassFilter,
@@ -56,13 +63,32 @@ export function useWorkbenchBootstrap({
   resetSegmentationForProject,
   resetExportsForProject,
 }: WorkbenchBootstrapOptions): void {
+  const foutMelder = useRef(onLoadError)
+  foutMelder.current = onLoadError
+
+  // Een mislukte laadactie werd overal met .catch(() => null) weggeslikt. De
+  // gebruiker zag dan "Nog geen bronnen beschikbaar", precies hetzelfde scherm
+  // als wanneer er echt niets is. Nu wordt de fout doorgegeven.
+  const meld = (onderdeel: string) => (fout: unknown) => {
+    foutMelder.current?.(onderdeel, fout)
+    return null
+  }
+
   useEffect(() => {
-    loadProjects().catch(() => null)
-    loadCapabilities().catch(() => null)
-    loadDetectionModels().catch(() => null)
-    loadSegmentationModels().catch(() => null)
+    loadProjects().catch(meld('werkruimtes'))
   }, [restrictedMode])
 
+  useEffect(() => {
+    if (activeWorkspace !== 'system') return
+    loadCapabilities().catch(meld('bronkoppelingen'))
+  }, [restrictedMode, activeWorkspace])
+
+  useEffect(() => {
+    if (activeWorkspace !== 'ai') return
+    loadDetectionModels().catch(meld('detectiemodellen'))
+    loadSegmentationModels().catch(meld('segmentatiemodellen'))
+  }, [restrictedMode, activeWorkspace])
+
   useEffect(() => {
     if (!selectedProjectId) {
       resetProjectData()
@@ -77,18 +103,32 @@ export function useWorkbenchBootstrap({
     resetDetectionForProject()
     resetSegmentationForProject()
     resetExportsForProject()
-    loadProjectData(selectedProjectId).catch(() => null)
-    loadQualityChecks(selectedProjectId).catch(() => null)
-    loadDetectionRuns(selectedProjectId).catch(() => null)
-    loadSegmentationRuns(selectedProjectId).catch(() => null)
-    loadExports(selectedProjectId).catch(() => null)
+    loadProjectData(selectedProjectId).catch(meld('gebieden en bronnen'))
   }, [restrictedMode, selectedProjectId])
 
   useEffect(() => {
-    loadDetectionResults().catch(() => null)
-  }, [restrictedMode, selectedDetectionRunId, detectionClassFilter, detectionMinConfidenceFilter])
+    if (!selectedProjectId || activeWorkspace !== 'analysis') return
+    loadQualityChecks(selectedProjectId).catch(meld('kwaliteitscontroles'))
+  }, [restrictedMode, selectedProjectId, activeWorkspace])
 
   useEffect(() => {
-    loadSegmentationResults().catch(() => null)
-  }, [restrictedMode, selectedSegmentationRunId, segmentationClassFilter, segmentationMinConfidenceFilter])
+    if (!selectedProjectId || activeWorkspace !== 'ai') return
+    loadDetectionRuns(selectedProjectId).catch(meld('detectieruns'))
+    loadSegmentationRuns(selectedProjectId).catch(meld('segmentatieruns'))
+  }, [restrictedMode, selectedProjectId, activeWorkspace])
+
+  useEffect(() => {
+    if (!selectedProjectId || activeWorkspace !== 'exports') return
+    loadExports(selectedProjectId).catch(meld('downloads'))
+  }, [restrictedMode, selectedProjectId, activeWorkspace])
+
+  useEffect(() => {
+    if (activeWorkspace !== 'ai') return
+    loadDetectionResults().catch(meld('detectieresultaten'))
+  }, [restrictedMode, activeWorkspace, selectedDetectionRunId, detectionClassFilter, detectionMinConfidenceFilter])
+
+  useEffect(() => {
+    if (activeWorkspace !== 'ai') return
+    loadSegmentationResults().catch(meld('segmentatieresultaten'))
+  }, [restrictedMode, activeWorkspace, selectedSegmentationRunId, segmentationClassFilter, segmentationMinConfidenceFilter])
 }

frontend/src/hooks/useWorkbenchTheme.test.tsx

@@ -0,0 +1,62 @@
+import { act, renderHook } from '@testing-library/react'
+import { afterEach, beforeEach, describe, expect, it } from 'vitest'
+import { useWorkbenchTheme } from './useWorkbenchTheme'
+
+const SLEUTEL = 'geointel.workbench-theme.v1'
+
+describe('useWorkbenchTheme', () => {
+  beforeEach(() => {
+    window.localStorage.clear()
+    delete document.body.dataset.theme
+  })
+
+  afterEach(() => {
+    window.localStorage.clear()
+  })
+
+  it('begint donker, ook wanneer het besturingssysteem licht meldt', () => {
+    // Browsers melden standaard 'light', ook als de gebruiker nooit iets
+    // instelde. Daarop afgaan zou vrijwel iedereen in de lichte werkstand
+    // zetten terwijl donker de gekozen richting is.
+    const { result } = renderHook(() => useWorkbenchTheme())
+    expect(result.current.theme).toBe('dark')
+    expect(document.body.dataset.theme).toBe('dark')
+  })
+
+  it('schakelt om en zet het attribuut op body', () => {
+    const { result } = renderHook(() => useWorkbenchTheme())
+    act(() => result.current.toggleTheme())
+    expect(result.current.theme).toBe('light')
+    expect(document.body.dataset.theme).toBe('light')
+
+    act(() => result.current.toggleTheme())
+    expect(result.current.theme).toBe('dark')
+    expect(document.body.dataset.theme).toBe('dark')
+  })
+
+  it('onthoudt de keuze voor een volgende sessie', () => {
+    const eerste = renderHook(() => useWorkbenchTheme())
+    act(() => eerste.result.current.toggleTheme())
+    eerste.unmount()
+
+    expect(window.localStorage.getItem(SLEUTEL)).toBe('light')
+
+    const tweede = renderHook(() => useWorkbenchTheme())
+    expect(tweede.result.current.theme).toBe('light')
+  })
+
+  it('blijft werken wanneer opslag geblokkeerd is', () => {
+    const origineel = window.localStorage.setItem
+    window.localStorage.setItem = () => {
+      throw new Error('opslag geweigerd')
+    }
+    try {
+      const { result } = renderHook(() => useWorkbenchTheme())
+      act(() => result.current.toggleTheme())
+      // Niet kunnen bewaren mag het omschakelen niet blokkeren.
+      expect(result.current.theme).toBe('light')
+    } finally {
+      window.localStorage.setItem = origineel
+    }
+  })
+})

frontend/src/hooks/useWorkbenchTheme.ts

@@ -0,0 +1,56 @@
+import { useCallback, useEffect, useState } from 'react'
+
+export type WorkbenchTheme = 'dark' | 'light'
+
+const OPSLAGSLEUTEL = 'geointel.workbench-theme.v1'
+
+/**
+ * De werkstand van de werkbank.
+ *
+ * Donker is de standaard: de werkbank staat tegen luchtbeelden en
+ * satellietdata aan, en een lichte schil daarnaast laat de kaart altijd
+ * verliezen. Maar donker-alleen is geen antwoord voor wie op een fel verlichte
+ * locatie werkt of een scherm deelt met een beamer, dus de keuze blijft.
+ *
+ * De keuze wordt per browser bewaard. Wie niets kiest krijgt donker. Het
+ * voorkeurssignaal van het besturingssysteem telt bewust niet mee: browsers
+ * melden standaard 'light', ook als de gebruiker nooit iets ingesteld heeft,
+ * en dan zou vrijwel iedereen in de lichte werkstand landen terwijl donker de
+ * gekozen richting van dit product is. Licht is een bewuste keuze, geen
+ * gevolg van een standaardwaarde elders.
+ */
+function beginwaarde(): WorkbenchTheme {
+  if (typeof window === 'undefined') return 'dark'
+  try {
+    const bewaard = window.localStorage.getItem(OPSLAGSLEUTEL)
+    if (bewaard === 'light' || bewaard === 'dark') return bewaard
+  } catch {
+    // Privémodus of geblokkeerde opslag: dan geldt gewoon de standaard.
+  }
+  return 'dark'
+}
+
+export function useWorkbenchTheme(): { theme: WorkbenchTheme; toggleTheme: () => void } {
+  const [theme, setTheme] = useState<WorkbenchTheme>(beginwaarde)
+
+  useEffect(() => {
+    document.body.dataset.theme = theme
+    return () => {
+      delete document.body.dataset.theme
+    }
+  }, [theme])
+
+  const toggleTheme = useCallback(() => {
+    setTheme((huidig) => {
+      const volgend: WorkbenchTheme = huidig === 'dark' ? 'light' : 'dark'
+      try {
+        window.localStorage.setItem(OPSLAGSLEUTEL, volgend)
+      } catch {
+        // Niet kunnen bewaren mag het omschakelen niet blokkeren.
+      }
+      return volgend
+    })
+  }, [])
+
+  return { theme, toggleTheme }
+}

frontend/src/main.tsx

@@ -1,6 +1,16 @@
 import { StrictMode } from 'react'
 import { createRoot } from 'react-dom/client'
-import './styles/app.css'
+// Elk geladen gewicht komt overeen met een stap uit de schaal in
+// geointel-system.css. Gewichten die niet geladen zijn vallen terug op het
+// dichtstbijzijnde gezicht, waardoor negen gedeclareerde gewichten er twee
+// worden en de hiërarchie verdwijnt.
+import '@fontsource/manrope/latin-600.css'
+import '@fontsource/manrope/latin-700.css'
+import '@fontsource/public-sans/latin-400.css'
+import '@fontsource/public-sans/latin-500.css'
+import '@fontsource/public-sans/latin-600.css'
+import '@fontsource/public-sans/latin-700.css'
+import './styles/base.css'
 import App from './App'
 
 createRoot(document.getElementById('root')!).render(

frontend/src/services/api/client.test.ts

@@ -0,0 +1,128 @@
+import { afterEach, beforeEach, describe, expect, it, vi } from 'vitest'
+import { apiGet, apiPost, vergeetGedeeldeVerzoeken } from './client'
+
+function antwoord(data: unknown) {
+  return {
+    ok: true,
+    status: 200,
+    json: async () => ({ data }),
+  } as unknown as Response
+}
+
+describe('apiGet deelt verzoeken', () => {
+  beforeEach(() => {
+    vi.useFakeTimers()
+  })
+
+  afterEach(() => {
+    vi.runOnlyPendingTimers()
+    vi.useRealTimers()
+    vi.restoreAllMocks()
+  })
+
+  it('stuurt één verzoek wanneer drie aanroepers tegelijk hetzelfde vragen', async () => {
+    const fetchSpy = vi.fn().mockResolvedValue(antwoord({ items: [1] }))
+    vi.stubGlobal('fetch', fetchSpy)
+
+    const [a, b, c] = await Promise.all([
+      apiGet<{ items: number[] }>('/api/v1/projects'),
+      apiGet<{ items: number[] }>('/api/v1/projects'),
+      apiGet<{ items: number[] }>('/api/v1/projects'),
+    ])
+
+    expect(fetchSpy).toHaveBeenCalledTimes(1)
+    expect(a).toEqual({ items: [1] })
+    expect(b).toBe(a)
+    expect(c).toBe(a)
+  })
+
+  it('deelt ook wanneer het tweede verzoek kort ná het eerste komt', async () => {
+    // Dit was het echte geval bij het opstarten: twee effecten die ongeveer
+    // negentig milliseconde na elkaar dezelfde gegevens opvroegen, dus de
+    // eerste was al klaar voordat de tweede begon.
+    const fetchSpy = vi.fn().mockResolvedValue(antwoord({ items: [] }))
+    vi.stubGlobal('fetch', fetchSpy)
+
+    await apiGet('/api/v1/projects/p-1/datasets')
+    await vi.advanceTimersByTimeAsync(90)
+    await apiGet('/api/v1/projects/p-1/datasets')
+
+    expect(fetchSpy).toHaveBeenCalledTimes(1)
+  })
+
+  it('haalt opnieuw op zodra het deelvenster voorbij is', async () => {
+    const fetchSpy = vi.fn().mockResolvedValue(antwoord({ items: [] }))
+    vi.stubGlobal('fetch', fetchSpy)
+
+    await apiGet('/api/v1/projects/p-1/areas')
+    await vi.advanceTimersByTimeAsync(400)
+    await apiGet('/api/v1/projects/p-1/areas')
+
+    expect(fetchSpy).toHaveBeenCalledTimes(2)
+  })
+
+  it('houdt verschillende paden uit elkaar', async () => {
+    const fetchSpy = vi.fn().mockResolvedValue(antwoord({ items: [] }))
+    vi.stubGlobal('fetch', fetchSpy)
+
+    await Promise.all([
+      apiGet('/api/v1/projects'),
+      apiGet('/api/v1/projects?name=Kempen&limit=1'),
+    ])
+
+    expect(fetchSpy).toHaveBeenCalledTimes(2)
+  })
+
+  it('deelt geen POST — twee keer versturen is een andere handeling', async () => {
+    const fetchSpy = vi.fn().mockResolvedValue(antwoord({ ok: true }))
+    vi.stubGlobal('fetch', fetchSpy)
+
+    await Promise.all([
+      apiPost('/api/v1/projects', { name: 'a' }),
+      apiPost('/api/v1/projects', { name: 'a' }),
+    ])
+
+    expect(fetchSpy).toHaveBeenCalledTimes(2)
+  })
+
+  it('deelt niets meer over een identiteitswissel heen', async () => {
+    // Uitloggen herlaadt de pagina niet, dus de tabel leeft door. Zonder deze
+    // reset zou de volgende gebruiker binnen het deelvenster het antwoord van
+    // de vorige kunnen krijgen.
+    const fetchSpy = vi.fn()
+      .mockResolvedValueOnce(antwoord({ items: ['werkruimte van A'] }))
+      .mockResolvedValueOnce(antwoord({ items: ['werkruimte van B'] }))
+    vi.stubGlobal('fetch', fetchSpy)
+
+    const vanA = await apiGet<{ items: string[] }>('/api/v1/projects')
+    vergeetGedeeldeVerzoeken()
+    const vanB = await apiGet<{ items: string[] }>('/api/v1/projects')
+
+    expect(fetchSpy).toHaveBeenCalledTimes(2)
+    expect(vanA.items).toEqual(['werkruimte van A'])
+    expect(vanB.items).toEqual(['werkruimte van B'])
+  })
+
+  it('wist de tabel ook wanneer de sessie verloopt', async () => {
+    const fetchSpy = vi.fn().mockResolvedValue(antwoord({ items: [] }))
+    vi.stubGlobal('fetch', fetchSpy)
+
+    await apiGet('/api/v1/projects')
+    window.dispatchEvent(new CustomEvent('geointel:session-expired'))
+    await apiGet('/api/v1/projects')
+
+    expect(fetchSpy).toHaveBeenCalledTimes(2)
+  })
+
+  it('laat een mislukt verzoek niet in de tabel achter', async () => {
+    const fetchSpy = vi.fn()
+      .mockRejectedValueOnce(new Error('netwerk weg'))
+      .mockResolvedValue(antwoord({ items: [] }))
+    vi.stubGlobal('fetch', fetchSpy)
+
+    await expect(apiGet('/api/v1/detection/models')).rejects.toThrow('netwerk weg')
+    await vi.advanceTimersByTimeAsync(400)
+    await expect(apiGet('/api/v1/detection/models')).resolves.toEqual({ items: [] })
+    expect(fetchSpy).toHaveBeenCalledTimes(2)
+  })
+})

frontend/src/services/api/client.ts

@@ -31,9 +31,64 @@ async function parseResponse<T>(response: Response): Promise<T> {
   return payload.data as T;
 }
 
+/**
+ * Gelijktijdige identieke GET-verzoeken worden gedeeld.
+ *
+ * Bij het opstarten vroegen drie verschillende plekken tegelijk om
+ * /api/v1/projects, en areas en datasets elk twee keer — 27 verzoeken in totaal
+ * waarvan vijf overbodig. Elke aanroeper hier krijgt dezelfde belofte zolang
+ * het verzoek onderweg is; zodra het klaar is verdwijnt het uit de tabel, dus
+ * er wordt niets gecachet en een volgende aanroep haalt gewoon opnieuw op.
+ *
+ * Alleen GET. Een POST twee keer versturen is een andere handeling en mag
+ * nooit stilzwijgend samengevoegd worden.
+ */
+const lopendeGets = new Map<string, Promise<unknown>>();
+
+/**
+ * Hoe lang een afgerond GET-verzoek nog gedeeld wordt.
+ *
+ * Puur gelijktijdige verzoeken samenvoegen was niet genoeg: bij het opstarten
+ * vroegen twee verschillende effecten dezelfde gebieden en bronnen op met
+ * ongeveer negentig milliseconde ertussen, dus was de eerste al klaar voordat
+ * de tweede begon. Dit venster is kort genoeg om nooit verouderde gegevens te
+ * tonen — een gebruiker die op "Vernieuwen" drukt zit er ruim boven — en lang
+ * genoeg om de opstartcascade op te vangen.
+ */
+const DEEL_VENSTER_MS = 300;
+
+/**
+ * Vergeet alle gedeelde antwoorden.
+ *
+ * Uitloggen herlaadt de pagina niet, dus zonder dit zou een antwoord van de ene
+ * gebruiker binnen het deelvenster nog aan de volgende geserveerd kunnen worden.
+ * Dat is binnen driehonderd milliseconde met de hand nauwelijks te bereiken,
+ * maar een verzoekcache die een identiteitswissel overleeft is hoe dan ook fout.
+ */
+export function vergeetGedeeldeVerzoeken(): void {
+  lopendeGets.clear();
+}
+
+if (typeof window !== "undefined") {
+  window.addEventListener("geointel:session-expired", vergeetGedeeldeVerzoeken);
+}
+
 export async function apiGet<T>(path: string): Promise<T> {
-  const response = await fetch(apiUrl(path), { credentials: "same-origin" });
-  return parseResponse<T>(response);
+  const lopend = lopendeGets.get(path);
+  if (lopend) {
+    return lopend as Promise<T>;
+  }
+
+  const verzoek = fetch(apiUrl(path), { credentials: "same-origin" })
+    .then((response) => parseResponse<T>(response))
+    .finally(() => {
+      window.setTimeout(() => {
+        lopendeGets.delete(path);
+      }, DEEL_VENSTER_MS);
+    });
+
+  lopendeGets.set(path, verzoek);
+  return verzoek;
 }
 
 export async function apiPost<T>(path: string, body?: object): Promise<T> {