Add remember-me support to Web apps with a working example

Add supported “Remember me” functionality to Objo Web apps so users can choose to stay signed in on the same browser for a configurable period, such as 30 days.

Developers should be able to issue a persistent login after validating a user's credentials, restore authentication when that user returns in a new browser session, and revoke the remembered login when they sign out. Include a complete working example and documentation covering the normal sign-in, remembered sign-in, expiry, and sign-out flows.

The Responsive Web Pages example currently includes a “Remember this browser” checkbox that only changes a label. Replace that placeholder behaviour with a working flow, or make the distinction clear and link it to the complete authentication example.