The no-payload settle gate in gateway-event.ts held session.info
running=false off unconditionally while an optimistically armed turn
(busy/awaitingResponse from restore/edit/submit) had not gone live
backend-side. When the turn never went live at all — a rewind refused
after the optimistic arm, a submit response lost to a gateway bounce, a
terminal error event that never arrived — busy latched forever:
isTargetSessionBusy refused every send, the composer queued each message
('moves to the send area'), and the queue drain (gated on busy→false)
never fired. Only an app restart cleared it (#86795).
Bound the hold to PRE_TURN_LIVE_SETTLE_GRACE_MS (15s) measured from
turnStartedAt; past the window (or with no clock) the gateway's
running=false is authoritative and settles the session. Seed the clock +
reset turnLive in applyRewindOptimistic/applyReloadOptimistic (the
restore/edit/regenerate arm sites), and clear both on every rewind
rollback path in use-prompt-actions and session-tile-actions so a failed
rewind can't leave a stale seed.
Fixes#86795
Teknium
2c0035d3b4