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/set/map.d.ts

@@ -0,0 +1,22 @@
+//#region src/set/map.d.ts
+/**
+ * Creates a new Set with elements transformed by the provided function.
+ *
+ * This function takes a Set and a function that generates a new value from each element.
+ * It returns a new Set where the elements are the result of applying the function to each element.
+ *
+ * @template T - The type of elements in the input Set.
+ * @template U - The type of elements in the output Set.
+ * @param set - The Set to transform.
+ * @param getNewValue - A function that generates a new value from an element.
+ * @returns A new Set with transformed elements.
+ *
+ * @example
+ * const set = new Set([1, 2, 3]);
+ * const result = map(set, (value) => value * 2);
+ * // result will be:
+ * // Set(3) { 2, 4, 6 }
+ */
+declare function map<T, U>(set: Set<T>, getNewValue: (value: T, value2: T, set: Set<T>) => U): Set<U>;
+//#endregion
+export { map };