Restoring a backup replaces the database, invalidating the database-backed
session (Auth.js session strategy: database). The old code silently reloaded
the page, leaving users on an empty board or a login screen with no context.
Replace the opaque reload with an explicit completion state that informs the
user their session was invalidated and auto-redirects to the sign-in page
(bypassing bfcache so the stale board cannot be restored).
Thomas Camlong
2a76bb185b