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/head.d.ts

@@ -0,0 +1,33 @@
+//#region src/compat/array/head.d.ts
+/**
+ * Returns the first element of an array or `undefined` if the array is empty.
+ *
+ * @template T - The type of elements in the array.
+ * @param array - A non-empty tuple with at least one element.
+ * @returns The first element of the array.
+ *
+ * @example
+ * const arr = [1, 2, 3] as const;
+ * const first = head(arr);
+ * // first will be 1
+ */
+declare function head<T>(array: readonly [T, ...unknown[]]): T;
+/**
+ * Returns the first element of an array or `undefined` if the array is empty.
+ *
+ * @template T - The type of elements in the array.
+ * @param array - The array from which to get the first element.
+ * @returns The first element of the array, or `undefined` if the array is empty/null/undefined.
+ *
+ * @example
+ * const arr = [1, 2, 3];
+ * const first = head(arr);
+ * // first will be 1
+ *
+ * const emptyArr: number[] = [];
+ * const noElement = head(emptyArr);
+ * // noElement will be undefined
+ */
+declare function head<T>(array: ArrayLike<T> | null | undefined): T | undefined;
+//#endregion
+export { head };