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/intersection.d.ts

@@ -0,0 +1,21 @@
+//#region src/fp/array/intersection.d.ts
+/**
+ * Creates a function that keeps values from the piped array that are also present in another array.
+ *
+ * Equality follows SameValueZero through Set membership, matching the main
+ * {@link intersection} implementation. The returned function is lazy-capable
+ * inside {@link pipe}.
+ *
+ * @template T - The type of elements in the arrays.
+ * @param secondArray - Values to intersect with the piped array.
+ * @returns A function that maps the piped array to its intersection.
+ *
+ * @example
+ * import { intersection, pipe } from 'es-toolkit/fp';
+ *
+ * pipe([1, 2, 3], intersection([2, 4]));
+ * // => [2]
+ */
+declare function intersection<T>(secondArray: readonly T[]): (array: readonly T[]) => T[];
+//#endregion
+export { intersection };