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/RechartsReduxContext.js

@@ -0,0 +1,17 @@
+import { createContext } from 'react';
+
+/*
+ * This is a copy of the React-Redux context type, but with our own store type.
+ * We could import directly from react-redux like this:
+ * import { ReactReduxContextValue } from 'react-redux/src/components/Context';
+ * but that makes typescript angry with some errors I am not sure how to resolve
+ * so copy it is.
+ */
+
+/**
+ * We need to use our own independent Redux context because we need to avoid interfering with other people's Redux stores
+ * in case they decide to install and use Recharts in another Redux app which is likely to happen.
+ *
+ * https://react-redux.js.org/using-react-redux/accessing-store#providing-custom-context
+ */
+export var RechartsReduxContext = /*#__PURE__*/createContext(null);