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/array/initial.d.ts

@@ -0,0 +1,17 @@
+//#region src/compat/array/initial.d.ts
+/**
+ * Returns a new array containing all elements except the last one from the input array.
+ * If the input array is empty or has only one element, the function returns an empty array.
+ *
+ * @template T The type of elements in the array.
+ * @param arr - The input array.
+ * @returns A new array containing all but the last element of the input array.
+ *
+ * @example
+ * const arr = [1, 2, 3, 4];
+ * const result = initial(arr);
+ * // result will be [1, 2, 3]
+ */
+declare function initial<T>(arr: ArrayLike<T> | null | undefined): T[];
+//#endregion
+export { initial };