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/map/mapValues.d.mts

@@ -0,0 +1,31 @@
+//#region src/map/mapValues.d.ts
+/**
+ * Creates a new Map with the same keys but with values transformed by the provided function.
+ *
+ * This function takes a Map and a function that generates a new value from each value-key pair.
+ * It returns a new Map where the values are the result of applying the function to each entry,
+ * while the keys remain the same.
+ *
+ * @template K - The type of keys in the Map.
+ * @template V - The type of values in the Map.
+ * @param map - The Map to transform.
+ * @param getNewValue - A function that generates a new value from a value-key pair.
+ * @returns A new Map with the same keys and transformed values.
+ *
+ * @example
+ * const map = new Map([
+ *   ['a', 1],
+ *   ['b', 2],
+ *   ['c', 3]
+ * ]);
+ * const result = mapValues(map, (value) => value * 2);
+ * // result will be:
+ * // Map(3) {
+ * //   'a' => 2,
+ * //   'b' => 4,
+ * //   'c' => 6
+ * // }
+ */
+declare function mapValues<K, V, R>(map: Map<K, V>, getNewValue: (value: V, key: K, object: Map<K, V>) => R): Map<K, R>;
+//#endregion
+export { mapValues };