feat: Recoil-State 'selectedAreaState' durch Redux ersetzt

- Redux-Slice 'selectedAreaSlice' erstellt mit set/clear Funktionen
- DataSheet.js verwendet dispatch(setSelectedArea(...)) für Dropdown-Auswahl
- MapComponent.js liest Bereichsauswahl über useSelector aus Redux Store
- Recoil-Importe entfernt, Zustand zentralisiert

redux/store.js

@@ -19,6 +19,7 @@ import poiLayerVisibleReducer from "./slices/poiLayerVisibleSlice";
 import poiReadFromDbTriggerReducer from "./slices/poiReadFromDbTriggerSlice";
 import polylineEventsDisabledReducer from "./slices/polylineEventsDisabledSlice";
 import readPoiMarkersStoreReducer from "./slices/readPoiMarkersStoreSlice";
+import selectedAreaReducer from "./slices/selectedAreaSlice";
 
 export const store = configureStore({
   reducer: {
@@ -41,5 +42,6 @@ export const store = configureStore({
     poiReadFromDbTrigger: poiReadFromDbTriggerReducer,
     polylineEventsDisabled: polylineEventsDisabledReducer,
     readPoiMarkersStore: readPoiMarkersStoreReducer,
+    selectedArea: selectedAreaReducer,
   },
 });