WIP: Brush funktioniert in Chart, aber soll Datum in Brush angezeigt

redux/slices/brushSlice.ts

@@ -0,0 +1,19 @@
+// brushSlice.ts (✅ Korrekt)
+import { createSlice } from "@reduxjs/toolkit";
+
+const brushSlice = createSlice({
+  name: "brush",
+  initialState: {
+    startIndex: 0,
+    endIndex: 0,
+  },
+  reducers: {
+    setBrushRange(state, action) {
+      state.startIndex = action.payload.startIndex;
+      state.endIndex = action.payload.endIndex;
+    },
+  },
+});
+
+export const { setBrushRange } = brushSlice.actions;
+export default brushSlice.reducer;