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/es-toolkit/dist/compat/function/defer.d.mts

@@ -0,0 +1,15 @@
+//#region src/compat/function/defer.d.ts
+/**
+ * Defers invoking the `func` until the current call stack has cleared. Any additional arguments are provided to func when it's invoked.
+ *
+ * @param func The function to defer.
+ * @param args The arguments to invoke `func` with.
+ * @returns Returns the timer id.
+ *
+ * @example
+ * defer(console.log, 'deferred');
+ * // => Logs 'deferred' after the current call stack has cleared.
+ */
+declare function defer(func: (...args: any[]) => any, ...args: any[]): number;
+//#endregion
+export { defer };