Two root causes destroyed terminal state during normal navigation:
1. The pagehide handler fired a shutdown beacon unconditionally, but on
mobile/Safari tab switches pagehide fires with event.persisted=true
(bfcache entry). This killed the server and all PTY sessions when the
user merely switched browser tabs. Fix: check event.persisted and skip
the beacon when the page is being cached, not unloaded.
2. ShellTerminal used project-agnostic session IDs ("default"), so
switching projects and switching back either collided with the old
session or spawned a new one, losing terminal state. Fix: scope session
IDs by project path (e.g. "default:/path/to/project") so the server's
getOrCreateSession returns the existing live PTY on reconnect.
Closes#2701
Co-authored-by: Claude Opus 4.6 <noreply@anthropic.com>
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