add analytics to 5chan.app

src/index.tsx

@@ -7,12 +7,19 @@ import './lib/init-translations';
 import './index.css';
 import './themes.css';
 import { App as CapacitorApp } from '@capacitor/app';
+import { Analytics } from '@vercel/analytics/react';
+
+// Only enable analytics on 5chan.app (Vercel deployment)
+// Exclude Electron (file:// or localhost), Capacitor/APK (capacitor:// or localhost), and IPFS (ipfs:// or different domain)
+const isVercelDeployment =
+  typeof window !== 'undefined' && (window.location.hostname === '5chan.app' || window.location.hostname === 'www.5chan.app') && !window.isElectron;
 
 const root = ReactDOM.createRoot(document.getElementById('root') as HTMLElement);
 root.render(
   <React.StrictMode>
     <Router>
       <App />
+      {isVercelDeployment && <Analytics />}
     </Router>
   </React.StrictMode>,
 );