80545e9f9d
- A restored game that no longer exists (cancelled/removed/revoked) drops to
the lobby with a toast instead of the in-game error state: game-state
exposes a `notFound` flag and the shell redirects via appScreen.go("lobby").
- Add a visible "return to lobby" control to the in-game header.
- Push/toast deep-links use activeView.select(...) (no URL); fix a latent
visibility-listener double-install on in-place game switches.
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>