fix(example): hydrate server-rendered React app

Author: 9aoy

examples/app-react-ssr/src/index.tsx

@@ -1,8 +1,8 @@
-import { createRoot } from 'react-dom/client';
+import { hydrateRoot } from 'react-dom/client';
 import App from './App';
 
 const root = document.getElementById('root');
 
 if (root) {
-  createRoot(root).render(<App />);
+  hydrateRoot(root, <App />);
 }