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/isNative.d.ts

@@ -0,0 +1,19 @@
+//#region src/compat/predicate/isNative.d.ts
+/**
+ * Checks if a given value is a native function.
+ *
+ * This function tests whether the provided value is a native function implemented by the JavaScript engine.
+ * It returns `true` if the value is a native function, and `false` otherwise.
+ *
+ * @param value - The value to test for native function.
+ * @returns `true` if the value is a native function, `false` otherwise.
+ *
+ * @example
+ * const value1 = Array.prototype.push;
+ * const value2 = () => {};
+ * const result1 = isNative(value1); // true
+ * const result2 = isNative(value2); // false
+ */
+declare function isNative(value: any): value is (...args: any[]) => any;
+//#endregion
+export { isNative };