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/function/before.d.ts

@@ -0,0 +1,32 @@
+//#region src/function/before.d.ts
+/**
+ * Creates a function that limits the number of times the given function (`func`) can be called.
+ *
+ * @template F - The type of the function to be invoked.
+ * @param n - The number of times the returned function is allowed to call `func` before stopping.
+ * - If `n` is 0, `func` will never be called.
+ * - If `n` is a positive integer, `func` will be called up to `n-1` times.
+ * @param func - The function to be called with the limit applied.
+ * @returns A new function that:
+ * - Tracks the number of calls.
+ * - Invokes `func` until the `n-1`-th call.
+ * - Returns `undefined` if the number of calls reaches or exceeds `n`, stopping further calls.
+ * @throws {Error} - Throw an error if `n` is negative.
+ * @example
+ *
+ * const beforeFn = before(3, () => {
+ *  console.log("called");
+ * })
+ *
+ * // Will log 'called'.
+ * beforeFn();
+ *
+ * // Will log 'called'.
+ * beforeFn();
+ *
+ * // Will not log anything.
+ * beforeFn();
+ */
+declare function before<F extends (...args: any[]) => any>(n: number, func: F): (...args: Parameters<F>) => ReturnType<F> | undefined;
+//#endregion
+export { before };