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/component/Cell.js

@@ -0,0 +1,15 @@
+/**
+ * Cell component used to define colors and styles of chart elements.
+ *
+ * This component is now deprecated and will be removed in Recharts 4.0.
+ *
+ * Please use the `shape` prop or `content` prop on the respective chart components
+ * to customize the rendering of chart elements instead of using `Cell`.
+ *
+ * @see {@link https://recharts.github.io/en-US/guide/cell/ Guide: Migrate from Cell component to shape prop}
+ *
+ * @deprecated
+ * @consumes CellReader
+ */
+export var Cell = _props => null;
+Cell.displayName = 'Cell';