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/hasValue.d.ts

@@ -0,0 +1,29 @@
+//#region src/map/hasValue.d.ts
+/**
+ * Checks if a Map contains a specific value.
+ *
+ * This function iterates through all values in the Map and checks if any value
+ * is equal to the search element using SameValueZero comparison (similar to
+ * Array.prototype.includes). This means that NaN is considered equal to NaN.
+ *
+ * @template K - The type of keys in the Map.
+ * @template V - The type of values in the Map.
+ * @param map - The Map to search.
+ * @param searchElement - The value to search for.
+ * @returns true if the Map contains the value, false otherwise.
+ *
+ * @example
+ * const map = new Map([
+ *   ['a', 1],
+ *   ['b', 2],
+ *   ['c', 3]
+ * ]);
+ * const result = hasValue(map, 2);
+ * // result will be: true
+ *
+ * const result2 = hasValue(map, 5);
+ * // result2 will be: false
+ */
+declare function hasValue<K, V>(map: Map<K, V>, searchElement: V): boolean;
+//#endregion
+export { hasValue };