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

redux/slices/kueChartModeSlice.ts

@@ -12,7 +12,7 @@ const initialState: KueChartModeState = {
 };
 
 export const kueChartModeSlice = createSlice({
-  name: "kueChartMode",
+  name: "kueChartModeSlice",
   initialState,
   reducers: {
     setActiveMode: (state, action: PayloadAction<"Schleife" | "TDR">) => {