feat: Redux-Struktur für LoopChart vereinheitlicht (DIA0–2 + Typ 3/4)

- Alle Schleifen- und Isolationswiderstandsdaten werden zentral in loopChart.data gespeichert
- Redux State unterstützt nun strukturierte Speicherung nach mode (DIA0–DIA2) und type (3/4)
- Bestehender Thunk fetchLoopChartDataThunk wurde angepasst zur Wiederverwendung
- Zugriff aus Komponente via loopData["DIAx"][type] möglich

redux/slices/loopChartSlice.ts

@@ -0,0 +1,48 @@
+// /redux/slices/loopChartSlice.ts
+import { createSlice } from "@reduxjs/toolkit";
+import { fetchLoopChartDataThunk } from "../thunks/fetchLoopChartDataThunk";
+
+interface ChartData {
+  [mode: string]: {
+    [type: number]: any;
+  };
+}
+
+interface LoopChartState {
+  data: ChartData;
+  loading: boolean;
+  error: string | null;
+}
+
+const initialState: LoopChartState = {
+  data: {},
+  loading: false,
+  error: null,
+};
+
+const loopChartSlice = createSlice({
+  name: "loopChart",
+  initialState,
+  reducers: {},
+  extraReducers: (builder) => {
+    builder
+      .addCase(fetchLoopChartDataThunk.pending, (state) => {
+        state.loading = true;
+        state.error = null;
+      })
+      .addCase(fetchLoopChartDataThunk.fulfilled, (state, action) => {
+        state.loading = false;
+        const { mode, type } = action.meta.arg;
+        if (!state.data[mode]) {
+          state.data[mode] = {};
+        }
+        state.data[mode][type] = action.payload;
+      })
+      .addCase(fetchLoopChartDataThunk.rejected, (state, action) => {
+        state.loading = false;
+        state.error = action.payload as string;
+      });
+  },
+});
+
+export default loopChartSlice.reducer;