Align on-demand map context

frontend/src/components/map/MapWorkspace.tsx

@@ -543,6 +543,7 @@ interface MapWorkspaceProps {
   selectedMapDatasetId: string
   onSelectMapArea: (areaId: string) => void
   onSetContextSourceLabel: (label: string | null) => void
+  onSetContextLayerLabel: (label: string | null) => void
   onOpenDatasetInMap: (dataset: DatasetCreateResponse) => void
   onSetAreaLayerVisible: (visible: boolean) => void
   onSetAreaLayerOpacity: (opacity: number) => void
@@ -628,6 +629,7 @@ export function MapWorkspace({
   selectedMapDatasetId,
   onSelectMapArea,
   onSetContextSourceLabel,
+  onSetContextLayerLabel,
   onOpenDatasetInMap,
   onSetAreaLayerVisible,
   onSetAreaLayerOpacity,
@@ -1035,6 +1037,23 @@ export function MapWorkspace({
   const activeResultDataset = activeThemeInsight?.dataset ?? activeThemeDataset
   const activeSelectionResult = activeThemeInsight?.result
     ?? (!regionalPartitionedThemeActive && selectedMapDataset?.id === activeThemeDataset?.id ? mapSelectionResult : null)
+  useEffect(() => {
+    const contextLayerLabel = analysisMode === 'current' && activeOnDemandMapProduct
+      ? activeSelectionResult
+        ? `${(
+            activeSelectionResult.total_feature_count
+            ?? activeSelectionResult.feature_count
+          ).toLocaleString('nl-BE')} objecten gemeten`
+        : 'Op aanvraag'
+      : null
+    onSetContextLayerLabel(contextLayerLabel)
+    return () => onSetContextLayerLabel(null)
+  }, [
+    activeOnDemandMapProduct,
+    activeSelectionResult,
+    analysisMode,
+    onSetContextLayerLabel,
+  ])
   const explorerMapFeatureCollection = regionalBathymetryThemeActive
     ? null
     : analysisMode === 'evolution' && temporalComparison?.geojson.features.length