클라이언트 상태 토글 기능 활성화 및 전역 알림 추가

devfront/src/main.tsx

@@ -2,6 +2,7 @@ import { QueryClientProvider } from "@tanstack/react-query";
 import { StrictMode } from "react";
 import { createRoot } from "react-dom/client";
 import { RouterProvider } from "react-router-dom";
+import { Toaster } from "./components/ui/toaster";
 import { queryClient } from "./app/queryClient";
 import { router } from "./app/routes";
 import "./index.css";
@@ -16,6 +17,7 @@ createRoot(rootElement).render(
   <StrictMode>
     <QueryClientProvider client={queryClient}>
       <RouterProvider router={router} />
+      <Toaster />
     </QueryClientProvider>
   </StrictMode>,
 );