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/function/unary.d.ts

@@ -0,0 +1,18 @@
+//#region src/function/unary.d.ts
+/**
+ * Creates a function that accepts up to one argument, ignoring any additional arguments.
+ *
+ * @template F - The type of the function.
+ * @param func - The function to cap arguments for.
+ * @returns Returns the new capped function.
+ *
+ * @example
+ * function fn(a, b, c) {
+ *   console.log(arguments);
+ * }
+ *
+ * unary(fn)(1, 2, 3); // [Arguments] { '0': 1 }
+ */
+declare function unary<F extends (...args: any[]) => any>(func: F): (...args: any[]) => ReturnType<F>;
+//#endregion
+export { unary };