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/isSubsetWith.d.mts

@@ -0,0 +1,21 @@
+//#region src/fp/array/isSubsetWith.d.ts
+/**
+ * Creates a predicate that checks subset membership with a custom equality function.
+ *
+ * Every value in the piped array must match at least one value in superset according
+ * to areItemsEqual.
+ *
+ * @template T - The type of elements in the arrays.
+ * @param superset - The array that may contain all values from the piped array.
+ * @param areItemsEqual - Returns true when a piped value and a superset value are equal.
+ * @returns A predicate for the piped array.
+ *
+ * @example
+ * import { isSubsetWith, pipe } from 'es-toolkit/fp';
+ *
+ * pipe([{ id: 1 }], isSubsetWith([{ id: 1 }, { id: 2 }], (a, b) => a.id === b.id));
+ * // => true
+ */
+declare function isSubsetWith<T>(superset: readonly T[], areItemsEqual: (item: T, other: T) => boolean): (array: readonly T[]) => boolean;
+//#endregion
+export { isSubsetWith };