Follow-up to the quick chat send fix. The send-time stale-stream recovery
only fires when a message is queued while the streaming flag is already
stuck, and the pre-session flush effect fires once on session activation and
bails permanently if a stream ref is lingering. Either gap leaves a queued
message stranded idle in the composer — shown locally but never sent to the
agent or persisted (so also absent from regular chat).
Add a delivery watchdog: whenever a message stays pending under an active
session, re-confirm after a short delay and force-deliver it if the server
reports no generation in flight and no live stream is connected. This is a
catch-all backstop independent of which targeted flush trigger bailed.
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
8cf32d5b2b