fix(geoportal): show only building body suffix (C1, C2) instead of full cadastral_ref

Strip parcel number prefix from building labels — "291479-C1" now displays as "C1".

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

src/modules/geoportal/components/map-viewer.tsx

@@ -487,10 +487,23 @@ export const MapViewer = forwardRef<MapViewerHandle, MapViewerProps>(
           paint: { "fill-color": "#3b82f6", "fill-opacity": 0.5 } });
         map.addLayer({ id: LAYER_IDS.cladiriLine, type: "line", source: SOURCES.cladiri, "source-layer": SOURCES.cladiri, minzoom: 14,
           paint: { "line-color": "#1e3a5f", "line-width": 0.6 } });
-        // Building cadastral_ref labels (e.g. C1, C2...)
+        // Building body labels — extract suffix after last dash (e.g. "291479-C1" → "C1")
         map.addLayer({ id: LAYER_IDS.cladiriLabel, type: "symbol", source: SOURCES.cladiri, "source-layer": SOURCES.cladiri, minzoom: 16,
           layout: {
-            "text-field": ["coalesce", ["get", "cadastral_ref"], ""],
+            "text-field": [
+              "case",
+              ["has", "cadastral_ref"],
+              ["let", "ref", ["get", "cadastral_ref"],
+                ["let", "dashIdx", ["index-of", "-", ["var", "ref"]],
+                  ["case",
+                    [">=", ["var", "dashIdx"], 0],
+                    ["slice", ["var", "ref"], ["+", ["var", "dashIdx"], 1]],
+                    ["var", "ref"],
+                  ],
+                ],
+              ],
+              "",
+            ],
             "text-font": ["Noto Sans Regular"],
             "text-size": 9, "text-anchor": "center", "text-allow-overlap": false,
             "text-max-width": 6,