git commit -m "refactor: last20Messages aus _app.tsx entfernt und über Thunk in dashboard.tsx geladen"

redux/thunks/fetchLast20MessagesThunk.ts

@@ -0,0 +1,12 @@
+import { createAsyncThunk } from "@reduxjs/toolkit";
+import { fetchLast20MessagesFromWindow } from "../../services/fetchLast20Messages";
+import { setLast20Messages } from "../slices/dashboardSlice";
+
+export const fetchLast20MessagesThunk = createAsyncThunk(
+  "dashboard/fetchLast20Messages",
+  async (_, { dispatch }) => {
+    const messages = await fetchLast20MessagesFromWindow();
+    dispatch(setLast20Messages(messages));
+    return messages;
+  }
+);