Improve map overlay ergonomics

backend/tests/test_sprint63_map_overlay_ergonomics.py

@@ -0,0 +1,32 @@
+from __future__ import annotations
+
+from pathlib import Path
+
+
+ROOT = Path(__file__).resolve().parents[2]
+
+
+def test_map_workspace_exposes_layer_provenance_and_feature_summary() -> None:
+    app = (ROOT / "frontend" / "src" / "App.tsx").read_text(encoding="utf-8")
+    map_workspace = (ROOT / "frontend" / "src" / "components" / "map" / "MapWorkspace.tsx").read_text(
+        encoding="utf-8"
+    )
+    css = (ROOT / "frontend" / "src" / "styles" / "app.css").read_text(encoding="utf-8")
+
+    assert "mapLayerSourceLabel" in app
+    assert "mapLayerProvenance" in app
+    assert "layer-provenance-rail" in map_workspace
+    assert "feature-summary-grid" in map_workspace
+    assert "feature-property-chip" in map_workspace
+    assert ".layer-provenance-rail" in css
+    assert ".feature-summary-grid" in css
+    assert ".feature-property-chip" in css
+
+
+def test_map_workspace_has_clear_empty_result_layer_guidance() -> None:
+    map_workspace = (ROOT / "frontend" / "src" / "components" / "map" / "MapWorkspace.tsx").read_text(
+        encoding="utf-8"
+    )
+
+    assert "No active vector or result layer" in map_workspace
+    assert "Open a dataset, detection run, segmentation run or change result to draw it here." in map_workspace