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/has.d.ts

@@ -0,0 +1,51 @@
+import { PropertyPath } from "../_internal/PropertyPath.js";
+
+//#region src/compat/object/has.d.ts
+/**
+ * Checks if a given path exists within an object.
+ *
+ * @template T
+ * @template K
+ * @param object - The object to query.
+ * @param path - The path to check.
+ * @returns & { [key: symbol]: unknown }} Returns a type guard indicating if the path exists in the object.
+ *
+ * @example
+ * const obj = { a: 1, b: { c: 2 } };
+ *
+ * if (has(obj, 'a')) {
+ *   console.log(obj.a); // TypeScript knows obj.a exists
+ * }
+ *
+ * if (has(obj, 'b')) {
+ *   console.log(obj.b.c); // TypeScript knows obj.b exists
+ * }
+ */
+declare function has<T, K extends PropertyKey>(object: T, path: K): object is T & { [P in K]: P extends keyof T ? T[P] : Record<string, unknown> extends T ? T[keyof T] : unknown } & {
+  [key: symbol]: unknown;
+};
+/**
+ * Checks if a given path exists within an object.
+ *
+ * @template T
+ * @param object - The object to query.
+ * @param path - The path to check. This can be a single property key,
+ *        an array of property keys, or a string representing a deep path.
+ * @returns Returns `true` if the path exists in the object, `false` otherwise.
+ *
+ * @example
+ * const obj = { a: { b: { c: 3 } } };
+ *
+ * has(obj, 'a'); // true
+ * has(obj, ['a', 'b']); // true
+ * has(obj, ['a', 'b', 'c']); // true
+ * has(obj, 'a.b.c'); // true
+ * has(obj, 'a.b.d'); // false
+ * has(obj, ['a', 'b', 'c', 'd']); // false
+ * has([], 0); // false
+ * has([1, 2, 3], 2); // true
+ * has([1, 2, 3], 5); // false
+ */
+declare function has<T>(object: T, path: PropertyPath): boolean;
+//#endregion
+export { has };