- The conversation page tells the rail and the sessions modal which
session it shows (announceShownSession, useShownSession); they reload,
so a session reopened by ?session_id= shows at once.
- Only that session is Current and greyed out (the active one without
?session_id=); the active row then leads back to it.
- The rail lists the session on screen even when it's older than its
latest sessions.
Co-Authored-By: Claude Opus 5.5 <[email protected]>
