Add shadcn alert to match project design

client/src/main.tsx

@@ -1,13 +1,12 @@
 import { StrictMode } from "react";
 import { createRoot } from "react-dom/client";
-import { ToastContainer } from "react-toastify";
-import "react-toastify/dist/ReactToastify.css";
+import { Toaster } from "@/components/ui/toaster.tsx";
 import App from "./App.tsx";
 import "./index.css";
 
 createRoot(document.getElementById("root")!).render(
   <StrictMode>
     <App />
-    <ToastContainer />
+    <Toaster />
   </StrictMode>,
 );