- main.tsx: on vite:preloadError (stale index.html referencing removed hashed chunks after a redeploy) reload the page immediately. - New ErrorBoundary around the whole router: render errors show a Persian fallback with «تلاش مجدد» instead of wiping the DOM. - nginx: index.html served with Cache-Control no-cache,no-store, must-revalidate (verified live); /assets/* stays public, immutable.