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/keyBy.d.ts

@@ -0,0 +1,31 @@
+//#region src/set/keyBy.d.ts
+/**
+ * Maps each element of a Set based on a provided key-generating function.
+ *
+ * This function takes a Set and a function that generates a key from each value.
+ * It returns a new Map where the keys are generated by the key function and the values are
+ * the corresponding values from the original set. If multiple elements produce the same key,
+ * the last value encountered will be used.
+ *
+ * @template T - The type of elements in the Set.
+ * @template K - The type of keys to produce in the returned Map.
+ * @param set - The set of elements to be mapped.
+ * @param getKeyFromValue - A function that generates a key from a value.
+ * @returns A Map where the generated keys are mapped to each element's value.
+ *
+ * @example
+ * const set = new Set([
+ *   { type: 'fruit', name: 'apple' },
+ *   { type: 'fruit', name: 'banana' },
+ *   { type: 'vegetable', name: 'carrot' }
+ * ]);
+ * const result = keyBy(set, item => item.type);
+ * // result will be:
+ * // Map(2) {
+ * //   'fruit' => { type: 'fruit', name: 'banana' },
+ * //   'vegetable' => { type: 'vegetable', name: 'carrot' }
+ * // }
+ */
+declare function keyBy<T, K>(set: Set<T>, getKeyFromValue: (value: T, value2: T, set: Set<T>) => K): Map<K, T>;
+//#endregion
+export { keyBy };