Opening a session in a new window (or any routed resume) could latch the
thread loader on "session" forever — the reported "stays stuck loading,
even after a nap" bug. Two compounding causes:
1. use-session-actions.resumeSession's catch ran the REST transcript
fallback OUTSIDE its own try. When session.resume rejected AND the
fallback also threw (the common case on a wedged/unreachable backend),
the throw skipped setMessages and left activeSessionId null with an
empty transcript — exactly the state the loader gates on
(messagesEmpty && !activeSessionId), with no terminal/error state.
2. use-route-resume's self-heal could never re-fire: resumeSession sets
selectedStoredSessionIdRef synchronously at entry (before failing), so
stuckOnRoutedSession stays false, and on an already-open idle window
neither pathnameChanged nor gatewayBecameOpen fire again. The window
never retried — naps, focus, nothing recovered it.
Fix:
- Wrap the REST fallback in its own try so a fallback failure can't strand
the loader.
- Add $resumeFailedSessionId: armed on terminal resume failure, cleared at
the next resume's entry (and left clear on success).
- use-route-resume gains a bounded backoff auto-retry (4 attempts, 1s→8s)
that re-resumes while the routed session matches the failure flag, with a
fire-time liveness recheck so a recovered session isn't double-resumed.
Regression tests cover: fallback-wrap arming the flag without throwing,
flag cleared on success, retry fires on backoff, no retry for a
non-routed/recovered session, and the retry cap.
Teknium
1e2c91eaff