feat(ui): Slot-Nummer nach links verschoben und Datumsauswahl horizontal ausgerichtet

- Slot-Nr.-Anzeige nach links im ActionBar verschoben.
- Datum-Labels („Von“ & „Bis“) und Eingabefelder horizontal ausgerichtet.
- Verbesserte UI/UX der Chart-Steuerungskomponenten.

redux/slices/brushSlice.ts

@@ -1,14 +1,23 @@
-// brushSlice.ts (✅ Korrekt)
+// brushSlice.ts
 import { createSlice } from "@reduxjs/toolkit";
 
+interface BrushState {
+  startIndex: number;
+  endIndex: number;
+  startDate: string | null;
+  endDate: string | null;
+}
+
+const initialState: BrushState = {
+  startIndex: 0,
+  endIndex: 0,
+  startDate: null,
+  endDate: null,
+};
+
 const brushSlice = createSlice({
   name: "brush",
-  initialState: {
-    startIndex: 0,
-    endIndex: 0,
-    startDate: null,
-    endDate: null,
-  },
+  initialState,
   reducers: {
     setBrushRange(state, action) {
       state.startIndex = action.payload.startIndex;
@@ -16,8 +25,15 @@ const brushSlice = createSlice({
       state.startDate = action.payload.startDate || state.startDate;
       state.endDate = action.payload.endDate || state.endDate;
     },
+    resetBrushRange(state) {
+      state.startIndex = 0;
+      state.endIndex = 0;
+      state.startDate = null;
+      state.endDate = null;
+    },
   },
 });
 
-export const { setBrushRange } = brushSlice.actions;
+export const { setBrushRange, resetBrushRange } = brushSlice.actions;
+
 export default brushSlice.reducer;