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/lib/context/legendPayloadContext.js

@@ -0,0 +1,15 @@
+"use strict";
+
+Object.defineProperty(exports, "__esModule", {
+  value: true
+});
+exports.useLegendPayload = useLegendPayload;
+var _hooks = require("../state/hooks");
+var _legendSelectors = require("../state/selectors/legendSelectors");
+/**
+ * Use this hook in Legend, or anywhere else where you want to read the current Legend items.
+ * @return all Legend items ready to be rendered
+ */
+function useLegendPayload() {
+  return (0, _hooks.useAppSelector)(_legendSelectors.selectLegendPayload);
+}