feat(redux): Rename all Redux slices and store keys to match file names for clarity

- Renamed all slice names (createSlice `name` attribute) to match their file names (e.g. loopChartSlice, authSlice, kueDataSlice etc.)
- Updated `store.ts` to register each reducer with consistent key names (e.g. state.loopChartSlice instead of state.loopChart)
- Adjusted all `useSelector` and Redux state accesses across the codebase
- Improves maintainability, searchability and consistency across files and Redux DevTools

components/main/kabelueberwachung/kue705FO/Charts/LoopMeasurementChart/DateRangePicker.tsx

@@ -20,10 +20,10 @@ const DateRangePicker: React.FC<DateRangePickerProps> = ({
   const dispatch = useDispatch();
 
   const reduxVonDatum = useSelector(
-    (state: RootState) => state.kabelueberwachungChart.vonDatum
+    (state: RootState) => state.kabelueberwachungChartSlice.vonDatum
   );
   const reduxBisDatum = useSelector(
-    (state: RootState) => state.kabelueberwachungChart.bisDatum
+    (state: RootState) => state.kabelueberwachungChartSlice.bisDatum
   );
 
   const today = new Date();