feat: Migration von selectedPoiSlice von Recoil zu Redux-Toolkit Slice

- Recoil Atom 'selectedPoiState' entfernt und durch Redux-Toolkit Slice ersetzt.
- Redux Actions hinzugefügt: setSelectedPoi, clearSelectedPoi.
- Selektor 'selectSelectedPoi' erstellt, um POI-Daten zu lesen.
- Komponenten angepasst (PoiUpdateModal, PoiUpdateModalWrapper, MapComponent), um Redux-Hooks zu verwenden.
- Reducer in rootReducer und store.js registriert.
- Funktionalität getestet und Fehlerbehebung implementiert.

components/pois/PoiUpdateModalWrapper.js

@@ -4,9 +4,13 @@ import PoiUpdateModal from "./PoiUpdateModal";
 import { useRecoilValue, useSetRecoilState } from "recoil";
 import { currentPoiState, selectedPoiState } from "../../redux/slices/currentPoiSlice";
 import { poiReadFromDbTriggerAtom } from "../../redux/slices/poiReadFromDbTriggerSlice";
+import { useDispatch } from "react-redux";
+import { setSelectedPoi } from "../../redux/slices/selectedPoiSlice";
 
 const PoiUpdateModalWrapper = ({ show, onClose, latlng }) => {
-  const setSelectedPoi = useSetRecoilState(selectedPoiState);
+  const dispatch = useDispatch();
+  //const setSelectedPoi = useSetRecoilState(selectedPoiState);
+  dispatch(setSelectedPoi(poiData));
   const setCurrentPoi = useSetRecoilState(currentPoiState);
   const currentPoi = useRecoilValue(currentPoiState);
   const poiReadTrigger = useRecoilValue(poiReadFromDbTriggerAtom);