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/ReportPolarOptions.js

@@ -0,0 +1,10 @@
+import { useEffect } from 'react';
+import { useAppDispatch } from './hooks';
+import { updatePolarOptions } from './polarOptionsSlice';
+export function ReportPolarOptions(props) {
+  var dispatch = useAppDispatch();
+  useEffect(() => {
+    dispatch(updatePolarOptions(props));
+  }, [dispatch, props]);
+  return null;
+}