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/compat/object/unset.d.mts

@@ -0,0 +1,21 @@
+//#region src/compat/object/unset.d.ts
+/**
+ * Removes the property at the given path of the object.
+ *
+ * @param obj - The object to modify.
+ * @param path - The path of the property to unset.
+ * @returns Returns true if the property is deleted, else false.
+ *
+ * @example
+ * const obj = { a: { b: { c: 42 } } };
+ * unset(obj, 'a.b.c'); // true
+ * console.log(obj); // { a: { b: {} } }
+ *
+ * @example
+ * const obj = { a: { b: { c: 42 } } };
+ * unset(obj, ['a', 'b', 'c']); // true
+ * console.log(obj); // { a: { b: {} } }
+ */
+declare function unset(obj: any, path: PropertyKey | readonly PropertyKey[]): boolean;
+//#endregion
+export { unset };