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/optionsSlice.js

@@ -0,0 +1,43 @@
+import { createSlice } from '@reduxjs/toolkit';
+import { isNan } from '../util/DataUtils';
+
+/**
+ * These chart options are decided internally, by Recharts,
+ * and will not change during the lifetime of the chart.
+ *
+ * Changing these options can be done by swapping the root element
+ * which will make a brand-new Redux store.
+ *
+ * If you want to store options that can be changed by the user,
+ * use UpdatableChartOptions in rootPropsSlice.ts.
+ */
+
+export var arrayTooltipSearcher = (data, strIndex) => {
+  if (!strIndex) return undefined;
+  if (!Array.isArray(data)) return undefined;
+  var numIndex = Number.parseInt(strIndex, 10);
+  if (isNan(numIndex)) {
+    return undefined;
+  }
+  return data[numIndex];
+};
+var initialState = {
+  chartName: '',
+  tooltipPayloadSearcher: () => undefined,
+  eventEmitter: undefined,
+  defaultTooltipEventType: 'axis'
+};
+var optionsSlice = createSlice({
+  name: 'options',
+  initialState,
+  reducers: {
+    createEventEmitter: state => {
+      if (state.eventEmitter == null) {
+        state.eventEmitter = Symbol('rechartsEventEmitter');
+      }
+    }
+  }
+});
+export var optionsReducer = optionsSlice.reducer;
+var createEventEmitter = optionsSlice.actions.createEventEmitter;
+export { createEventEmitter };