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/einausgaenge/DigitalInputs.tsx

@@ -6,7 +6,7 @@ import { Icon } from "@iconify/react";
 
 export default function DigitalInputs({ openInputModal }) {
   const digitalInputs = useSelector(
-    (state: RootState) => state.digitalInputs.inputs
+    (state: RootState) => state.digitalInputsSlice.inputs
   );
 
   // **Gruppiere Eingänge in zwei Tabellen**