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/array/compact.d.ts

@@ -0,0 +1,16 @@
+//#region src/array/compact.d.ts
+type NotFalsey<T> = Exclude<T, false | null | 0 | 0n | '' | undefined>;
+/**
+ * Removes falsey values (false, null, 0, -0, 0n, '', undefined, NaN) from an array.
+ *
+ * @template T - The type of elements in the array.
+ * @param arr - The input array to remove falsey values.
+ * @returns A new array with all falsey values removed.
+ *
+ * @example
+ * compact([0, -0, 0n, 1, false, 2, '', 3, null, undefined, 4, NaN, 5]);
+ * Returns: [1, 2, 3, 4, 5]
+ */
+declare function compact<T>(arr: readonly T[]): Array<NotFalsey<T>>;
+//#endregion
+export { compact };