* Fix stale terminal panes after backgrounding by retrying foreground reco
- Foreground recovery was skipping the replay when resume landed mid-reconnect
(socket typically dies after 60-80s backgrounded), leaving WKWebView panes
blank until a manual tab switch. Recovery now returns a 'deferred' outcome
and the session screen retries it once connState flips back to connected.
- Fix a related race where a newly created tab's web-ready subscribe could be
skipped if a lagging session-tab snapshot reset activeHandleRef before the
subscribe fired; track the intended active handle separately.
* Fix stale pending terminal handle outliving a failed create
Clear pendingActiveTerminalHandleRef when terminal creation returns
no handle, since web-ready subscribe logic gates on this ref being
active and would otherwise see a stale value.
Jinjing
8ced4b9e4b