Keep visited routes available offline

Set eligible routes' static data:

staticData: { radical: { offline: true } },

Wrap defaultStreamHandler with offlineHandler from @akshatowo/radical/tanstack-start-server in src/server.ts.

Create public/offline.html.

void registerOffline({
  mode: config.mode,
  production: import.meta.env.PROD,
  base: import.meta.env.BASE_URL,
});

After worker activation in a production build, visit each exact URL through document navigation, then stop the UI server.

Reopen	Expected result
Visited URL, including query string	Stored document
Unvisited URL	Offline fallback

Serve over HTTPS or trustworthy localhost. Plain HTTP LAN addresses cannot register workers.

See shell startup checks for Android and iOS.