Clear stale on-demand map layers

CHANGELOG.md

@@ -22,7 +22,8 @@
   products are usable on demand without browser-side external calls.
 - Prevented a single bounded municipality Dataset from being presented as
   complete Flanders coverage; GRB cards remain `Op aanvraag` until the active
-  selection has produced its measured result.
+  selection has produced its measured result, and stale previously opened
+  vector features are not rendered behind an on-demand theme.
 - Updated the provider registry to report the bounded GRB integration as
   configured while keeping the old generic import/fetch contract non-fetching
   and directing callers to the governed project endpoint.

backend/tests/test_sprint239_bounded_grb_acquisition.py

@@ -389,5 +389,6 @@ def test_grb_frontend_and_contracts_use_only_the_governed_backend_path() -> None
     assert "datasetsApi.listGrbProducts" in catalog_hook
     assert "officialMapProducts.grb" in workspace
     assert "result[product.key] = null" in workspace
+    assert ": onDemandThemeActive\n        ? null\n        : mapFeatureCollection" in workspace
     assert "/datasets/grb/acquire" in contracts
     assert "geo.api.vlaanderen.be" not in workspace

docs/CODEX_EXECUTION_LOG.md

@@ -10245,7 +10245,8 @@ Implemented:
 - Browser acceptance caught and closed a coverage-label defect: a newly
   acquired small Mol Dataset no longer makes a complete-Flanders theme card
   appear fully loaded. In the Flanders workspace GRB stays `Op aanvraag`;
-  the exact bounded result is shown only after selection.
+  the exact bounded result is shown only after selection and an older active
+  vector layer is not rendered behind it.
 
 Validation:
 - Focused provider, acquisition, route-envelope and frontend contract tests
@@ -10258,3 +10259,12 @@ Validation:
 - The complete readiness gate passed 943 backend tests, backend compilation,
   the 118-route API contract audit, Alembic head `202607160001`, frontend
   TypeScript typecheck and the production Vite build.
+- Tower live acceptance persisted bounded Mol GRB results through PostGIS:
+  339 building contours (5.953873 ha footprint), one road segment
+  (0.0137304 km), two water features (0.0027273 ha plus 0.0050982 km
+  supporting linework) and eight parcels (1.2566294 ha). A repeated exact
+  building request reused the same Dataset and reported `reused=true`.
+- The rebuilt all-in-one deployment remained healthy on port 1202 with
+  PostGIS 3.6 and Alembic head `202607160001`. Live browser acceptance showed
+  all four Flanders GRB cards as `Op aanvraag` and no stale vector content
+  underneath an unmeasured on-demand theme.

frontend/src/components/map/MapWorkspace.tsx

@@ -1039,6 +1039,8 @@ export function MapWorkspace({
     ? null
     : analysisMode === 'evolution' && temporalComparison?.geojson.features.length
       ? temporalComparison.geojson
+      : onDemandThemeActive
+        ? null
         : mapFeatureCollection
   const explorerSelectionFeatureCollection = analysisMode === 'current'
     ? activeSelectionResult?.geojson ?? null