fix: use strict mode for demo app

Author: myandrienko

examples/vite/src/main.tsx

@@ -1,5 +1,10 @@
+import { StrictMode } from 'react';
 import ReactDOM from 'react-dom/client';
 import App from './App.tsx';
 import './index.scss';
 
-ReactDOM.createRoot(document.getElementById('root')!).render(<App />);
+ReactDOM.createRoot(document.getElementById('root')!).render(
+  <StrictMode>
+    <App />
+  </StrictMode>,
+);