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/isArguments.d.mts

@@ -0,0 +1,24 @@
+//#region src/compat/predicate/isArguments.d.ts
+/**
+ * Checks if the given value is an arguments object.
+ *
+ * This function tests whether the provided value is an arguments object or not.
+ * It returns `true` if the value is an arguments object, and `false` otherwise.
+ *
+ * This function can also serve as a type predicate in TypeScript, narrowing the type of the argument to an arguments object.
+ *
+ * @param value - The value to test if it is an arguments object.
+ * @returns `true` if the value is an arguments, `false` otherwise.
+ *
+ * @example
+ * const args = (function() { return arguments; })();
+ * const strictArgs = (function() { 'use strict'; return arguments; })();
+ * const value = [1, 2, 3];
+ *
+ * console.log(isArguments(args)); // true
+ * console.log(isArguments(strictArgs)); // true
+ * console.log(isArguments(value)); // false
+ */
+declare function isArguments(value?: any): value is IArguments;
+//#endregion
+export { isArguments };