refactor: Entfernt Recoil-Atoms mapIdState & userIdState – ersetzt durch Redux-Slice urlParameter

- MapComponent.js nutzt jetzt useSelector für mapId/userId
- Übergabe dynamischer Parameter via dispatch(setMapId), dispatch(setUserId)
- Store um urlParameterReducer erweitert

redux/slices/urlParameterSlice.js

@@ -1,14 +1,28 @@
-// /redux/slices/urlParameterSlice.js
-import { atom } from "recoil";
+// redux/slices/urlParameterSlice.js
+import { createSlice } from "@reduxjs/toolkit";
 
-// Atom für die Speicherung der mapId aus der URL
-export const mapIdState = atom({
-  key: "mapIdState", // Eindeutiger Schlüssel (innerhalb des gesamten Projekts)
-  default: "10", // Standardwert
+const initialState = {
+  mapId: "10",
+  userId: "484",
+};
+
+const urlParameterSlice = createSlice({
+  name: "urlParameter",
+  initialState,
+  reducers: {
+    setMapId: (state, action) => {
+      state.mapId = action.payload;
+    },
+    setUserId: (state, action) => {
+      state.userId = action.payload;
+    },
+    setFromURL: (state, action) => {
+      const { m, u } = action.payload;
+      if (m) state.mapId = m;
+      if (u) state.userId = u;
+    },
+  },
 });
 
-// Atom für die Speicherung der userId aus der URL
-export const userIdState = atom({
-  key: "userIdState",
-  default: "484",
-});
+export const { setMapId, setUserId, setFromURL } = urlParameterSlice.actions;
+export default urlParameterSlice.reducer;