feat: Add cursor wait during chart data loading

- Implemented cursor wait state while chart data is being loaded in `AnalogInputsChart.tsx`.
- Fixed missing dependencies in `useEffect` and defined `loading` state.
- Updated `handleFetchData` to manage

components/main/analogInputs/AnalogInputsChart.tsx

@@ -28,6 +28,7 @@ import {
 } from "@/redux/slices/analogInputs/analogInputsHistorySlice";
 import { getColor } from "@/utils/colors";
 import AnalogInputsDatePicker from "./AnalogInputsDatePicker";
+import type { ChartJSOrUndefined } from "react-chartjs-2/dist/types";
 
 // ✅ Nur die Basis-ChartJS-Module registrieren
 ChartJS.register(
@@ -53,7 +54,11 @@ export default function AnalogInputsChart() {
   }, []);
 
   const dispatch = useDispatch<AppDispatch>();
-  const chartRef = useRef<Line>(null); // Specify Line type for chartRef
+
+  const chartRef =
+    useRef<
+      ChartJSOrUndefined<"line", { x: Date; y: number | undefined }[], unknown>
+    >(null);
 
   // Redux Werte für Chart-Daten
   const { zeitraum, vonDatum, bisDatum, data, autoLoad, selectedId } =