feat(geoportal): selection modes (click/rectangle/freehand) + export DXF/GPKG only

- Selection toolbar: 3 modes — Click (individual), Dreptunghi (area), Desen (freehand)
- Each mode has tooltip explaining usage
- Export: removed GeoJSON, only DXF + GPKG. GPKG labeled "cu metadata"
- DXF export fix: -s_srs + -t_srs (was -a_srs + -t_srs)

Note: rectangle and freehand drawing on map not yet implemented (UI ready,
map interaction coming next session).

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

src/modules/geoportal/components/geoportal-module.tsx

@@ -5,7 +5,7 @@ import dynamic from "next/dynamic";
 import { LayerPanel, getDefaultVisibility } from "./layer-panel";
 import { BasemapSwitcher } from "./basemap-switcher";
 import { SearchBar } from "./search-bar";
-import { SelectionToolbar } from "./selection-toolbar";
+import { SelectionToolbar, type SelectionMode } from "./selection-toolbar";
 import { FeatureInfoPanel } from "./feature-info-panel";
 import type { MapViewerHandle } from "./map-viewer";
 import type {
@@ -29,7 +29,7 @@ export function GeoportalModule() {
   const [basemap, setBasemap] = useState<BasemapId>("liberty");
   const [layerVisibility, setLayerVisibility] = useState<LayerVisibility>(getDefaultVisibility);
   const [clickedFeature, setClickedFeature] = useState<ClickedFeature | null>(null);
-  const [selectionMode, setSelectionMode] = useState(false);
+  const [selectionMode, setSelectionMode] = useState<SelectionMode>("off");
   const [selectedFeatures, setSelectedFeatures] = useState<SelectedFeature[]>([]);
   const [flyTarget, setFlyTarget] = useState<{ center: [number, number]; zoom?: number } | undefined>();
 
@@ -48,14 +48,12 @@ export function GeoportalModule() {
     }
   }, []);
 
-  const handleToggleSelectionMode = useCallback(() => {
-    setSelectionMode((prev) => {
-      if (prev) {
-        mapHandleRef.current?.clearSelection();
-        setSelectedFeatures([]);
-      }
-      return !prev;
-    });
+  const handleSelectionModeChange = useCallback((mode: SelectionMode) => {
+    if (mode === "off") {
+      mapHandleRef.current?.clearSelection();
+      setSelectedFeatures([]);
+    }
+    setSelectionMode(mode);
   }, []);
 
   return (
@@ -64,7 +62,7 @@ export function GeoportalModule() {
         ref={mapHandleRef}
         className="h-full w-full"
         basemap={basemap}
-        selectionMode={selectionMode}
+        selectionMode={selectionMode !== "off"}
         onFeatureClick={handleFeatureClick}
         onSelectionChange={setSelectedFeatures}
         layerVisibility={layerVisibility}
@@ -81,7 +79,7 @@ export function GeoportalModule() {
       {/* Top-right: basemap switcher + feature panel (aligned) */}
       <div className="absolute top-3 right-14 z-10 flex flex-col items-end gap-2">
         <BasemapSwitcher value={basemap} onChange={setBasemap} />
-        {clickedFeature && !selectionMode && (
+        {clickedFeature && selectionMode === "off" && (
           <FeatureInfoPanel feature={clickedFeature} onClose={() => setClickedFeature(null)} />
         )}
       </div>
@@ -91,7 +89,7 @@ export function GeoportalModule() {
         <SelectionToolbar
           selectedFeatures={selectedFeatures}
           selectionMode={selectionMode}
-          onToggleSelectionMode={handleToggleSelectionMode}
+          onSelectionModeChange={handleSelectionModeChange}
           onClearSelection={() => { mapHandleRef.current?.clearSelection(); setSelectedFeatures([]); }}
         />
       </div>