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/predicate/isArray.d.mts

@@ -0,0 +1,46 @@
+//#region src/compat/predicate/isArray.d.ts
+/**
+ * Checks if the given value is an array.
+ *
+ * This function tests whether the provided value is an array or not.
+ * It returns `true` if the value is an array, and `false` otherwise.
+ *
+ * This function can also serve as a type predicate in TypeScript, narrowing the type of the argument to an array.
+ *
+ * @param value - The value to test if it is an array.
+ * @returns `true` if the value is an array, `false` otherwise.
+ *
+ * @example
+ * const value1 = [1, 2, 3];
+ * const value2 = 'abc';
+ * const value3 = () => {};
+ *
+ * console.log(isArray(value1)); // true
+ * console.log(isArray(value2)); // false
+ * console.log(isArray(value3)); // false
+ */
+declare function isArray(value?: any): value is any[];
+/**
+ * Checks if the given value is an array with generic type support.
+ *
+ * This function tests whether the provided value is an array or not.
+ * It returns `true` if the value is an array, and `false` otherwise.
+ *
+ * This function can also serve as a type predicate in TypeScript, narrowing the type of the argument to an array.
+ *
+ * @template T - The type of elements in the array.
+ * @param value - The value to test if it is an array.
+ * @returns `true` if the value is an array, `false` otherwise.
+ *
+ * @example
+ * const value1 = [1, 2, 3];
+ * const value2 = 'abc';
+ * const value3 = () => {};
+ *
+ * console.log(isArray<number>(value1)); // true
+ * console.log(isArray<string>(value2)); // false
+ * console.log(isArray<Function>(value3)); // false
+ */
+declare function isArray<T>(value?: any): value is any[];
+//#endregion
+export { isArray };