Fix Leaflet map initialization: prevent DOM errors and ensure robust container checks

- Refactored initializeMap to accept the DOM node instead of the ref object
- Updated all checks to use the DOM node directly
- Improved useInitializeMap to only call initializeMap when the container is ready
- Prevents "mapRef.current ist nicht definiert oder nicht im DOM" errors
- Ensures map is only initialized when the container is attached

components/uiWidgets/mapLayersControlPanel/MapLayersControlPanel.js

@@ -343,7 +343,7 @@ function MapLayersControlPanel() {
               ).values(),
             */}
             {GisStationsStaticDistrict.Points.filter(p => !!p.Area_Name).map((item, index) => (
-              <option key={item.Area_Name} value={item.IdLD}>
+              <option key={item.Area_Name + "-" + item.IdLD} value={item.IdLD}>
                 {item.Area_Name}
               </option>
             ))}