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/initial.d.ts

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+//#region src/array/initial.d.ts
+/**
+ * Returns an empty array when the input is a tuple containing exactly one element.
+ *
+ * @template T The type of the single element.
+ * @param arr - A tuple containing exactly one element.
+ * @returns An empty array since there is only one element.
+ *
+ * @example
+ * const array = [100] as const;
+ * const result = initial(array);
+ * // result will be []
+ */
+declare function initial<T>(arr: readonly [T]): [];
+/**
+ * Returns an empty array when the input array is empty.
+ *
+ * @returns Always returns an empty array for an empty input.
+ *
+ * @example
+ * const array = [] as const;
+ * const result = initial(array);
+ * // result will be []
+ */
+declare function initial(arr: readonly []): [];
+/**
+ * Returns a new array containing all elements except the last one from a tuple with multiple elements.
+ *
+ * @template T The types of the initial elements.
+ * @template U The type of the last element in the tuple.
+ * @param arr - A tuple with one or more elements.
+ * @returns A new array containing all but the last element of the tuple.
+ *
+ * @example
+ * const array = ['apple', 'banana', 'cherry'] as const;
+ * const result = initial(array);
+ * // result will be ['apple', 'banana']
+ */
+declare function initial<T, U>(arr: readonly [...T[], U]): T[];
+/**
+ * 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: readonly T[]): T[];
+//#endregion
+export { initial };