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/intersection.d.mts

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+//#region src/compat/array/intersection.d.ts
+/**
+ * Returns the intersection of multiple arrays.
+ *
+ * This function takes multiple arrays and returns a new array containing the elements that are
+ * present in all provided arrays. It effectively filters out any elements that are not found
+ * in every array.
+ *
+ * @template T - The type of elements in the arrays.
+ * @param arrays - The arrays to compare.
+ * @returns A new array containing the elements that are present in all arrays.
+ *
+ * @example
+ * const array1 = [1, 2, 3, 4, 5];
+ * const array2 = [3, 4, 5, 6, 7];
+ * const result = intersection(array1, array2);
+ * // result will be [3, 4, 5] since these elements are in both arrays.
+ */
+declare function intersection<T>(...arrays: Array<ArrayLike<T> | null | undefined>): T[];
+//#endregion
+export { intersection };