Add settings page for managing forecasting API key and URL via UI

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

frontend/node_modules/recharts/es6/state/referenceElementsSlice.js

@@ -0,0 +1,49 @@
+import { createSlice, current } from '@reduxjs/toolkit';
+import { castDraft } from 'immer';
+var initialState = {
+  dots: [],
+  areas: [],
+  lines: []
+};
+export var referenceElementsSlice = createSlice({
+  name: 'referenceElements',
+  initialState,
+  reducers: {
+    addDot: (state, action) => {
+      state.dots.push(action.payload);
+    },
+    removeDot: (state, action) => {
+      var index = current(state).dots.findIndex(dot => dot === action.payload);
+      if (index !== -1) {
+        state.dots.splice(index, 1);
+      }
+    },
+    addArea: (state, action) => {
+      state.areas.push(action.payload);
+    },
+    removeArea: (state, action) => {
+      var index = current(state).areas.findIndex(area => area === action.payload);
+      if (index !== -1) {
+        state.areas.splice(index, 1);
+      }
+    },
+    addLine: (state, action) => {
+      state.lines.push(castDraft(action.payload));
+    },
+    removeLine: (state, action) => {
+      var index = current(state).lines.findIndex(line => line === action.payload);
+      if (index !== -1) {
+        state.lines.splice(index, 1);
+      }
+    }
+  }
+});
+var _referenceElementsSli = referenceElementsSlice.actions,
+  addDot = _referenceElementsSli.addDot,
+  removeDot = _referenceElementsSli.removeDot,
+  addArea = _referenceElementsSli.addArea,
+  removeArea = _referenceElementsSli.removeArea,
+  addLine = _referenceElementsSli.addLine,
+  removeLine = _referenceElementsSli.removeLine;
+export { addDot, removeDot, addArea, removeArea, addLine, removeLine };
+export var referenceElementsReducer = referenceElementsSlice.reducer;