Add governed buildings register snapshot

frontend/src/components/datasets/SourceCatalogPanel.tsx

@@ -108,6 +108,12 @@ export function SourceCatalogPanel({ datasets }: SourceCatalogPanelProps): JSX.E
   )
   const bwkDatasets = ready.filter((dataset) => dataset.source_name === 'inbo_bwk_natura2000')
   const agricultureDatasets = ready.filter((dataset) => dataset.source_name === 'agentschap_landbouw_zeevisserij_agricultural_parcels')
+  const buildingsRegisterDatasets = ready.filter(
+    (dataset) => dataset.source_name === 'digitaal_vlaanderen_buildings_addresses_register',
+  )
+  const latestBuildingsRegister = [...buildingsRegisterDatasets].sort(
+    (left, right) => new Date(right.observed_at ?? 0).getTime() - new Date(left.observed_at ?? 0).getTime(),
+  )[0]
   const agricultureYears = agricultureDatasets
     .flatMap((dataset) => dataset.observed_at ? [new Date(dataset.observed_at).getUTCFullYear()] : [])
   const pendingSources = AVAILABLE_SOURCES.filter((source) => {
@@ -115,6 +121,7 @@ export function SourceCatalogPanel({ datasets }: SourceCatalogPanelProps): JSX.E
     if (source.key === 'historical_orthophoto') return historicalOrthophotos.length === 0
     if (source.key === 'bwk') return bwkDatasets.length === 0
     if (source.key === 'agriculture') return agricultureDatasets.length === 0
+    if (source.key === 'buildings_register') return buildingsRegisterDatasets.length === 0
     return true
   })
   const themes = Object.keys(THEME_LABELS).map((theme) => {
@@ -174,7 +181,7 @@ export function SourceCatalogPanel({ datasets }: SourceCatalogPanelProps): JSX.E
         ))}
       </div>
 
-      {waterinfoDatasets.length > 0 || historicalOrthophotos.length > 0 || bwkDatasets.length > 0 || agricultureDatasets.length > 0 ? (
+      {waterinfoDatasets.length > 0 || historicalOrthophotos.length > 0 || bwkDatasets.length > 0 || agricultureDatasets.length > 0 || buildingsRegisterDatasets.length > 0 ? (
         <div className="source-catalog-loaded" aria-label="Aanvullende ingeladen bronnen">
           {waterinfoDatasets.length > 0 ? (
             <article>
@@ -204,6 +211,17 @@ export function SourceCatalogPanel({ datasets }: SourceCatalogPanelProps): JSX.E
               <p>Oppervlakte en officiële hoofdteeltgroepen zijn historisch vergelijkbaar; perceelidentiteiten blijven bewust niet gekoppeld tussen jaren.</p>
             </article>
           ) : null}
+          {latestBuildingsRegister ? (
+            <article>
+              <strong>Gebouwen- en Adressenregister</strong>
+              <span>
+                {(latestBuildingsRegister.feature_count ?? 0).toLocaleString('nl-BE')} gebouwen · {' '}
+                {Number(latestBuildingsRegister.source_metadata?.['building_unit_count'] ?? 0).toLocaleString('nl-BE')} eenheden · {' '}
+                {Number(latestBuildingsRegister.source_metadata?.['linked_address_count'] ?? 0).toLocaleString('nl-BE')} gekoppelde adressen
+              </span>
+              <p>Registerstatus en geaggregeerde koppelingen voor Mol; adreslabels en persoonsgegevens worden niet in de kaartlaag getoond.</p>
+            </article>
+          ) : null}
         </div>
       ) : null}