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/fp/array/last.d.ts

@@ -0,0 +1,35 @@
+//#region src/fp/array/last.d.ts
+/**
+ * Creates a function that returns the last element of a non-empty array.
+ *
+ * This overload preserves the non-empty tuple guarantee: the returned function
+ * always returns T when the piped array has at least one element.
+ *
+ * @template T - The type of elements in the array.
+ * @returns A function that maps a non-empty readonly array to its last element.
+ *
+ * @example
+ * import { last, pipe } from 'es-toolkit/fp';
+ *
+ * pipe([1, 2, 3] as const, last());
+ * // => 3
+ */
+declare function last<T>(): (array: readonly [...T[], T]) => T;
+/**
+ * Creates a function that returns the last element of an array, or undefined.
+ *
+ * Empty arrays return undefined, matching the main {@link last} behavior. Use
+ * the returned function with {@link pipe}.
+ *
+ * @template T - The type of elements in the array.
+ * @returns A function that maps a readonly array to its last element, or undefined.
+ *
+ * @example
+ * import { last, pipe } from 'es-toolkit/fp';
+ *
+ * pipe([] as number[], last());
+ * // => undefined
+ */
+declare function last<T>(): (array: readonly T[]) => T | undefined;
+//#endregion
+export { last };