- Every playlist mutation is sent on the version it was read at: the
payload's ETag, else the playlist's last read (portal documents have no
payload). Refused versions are tracked per playlist, so a conflict on
one never disables the check on another at the same revision. Imports
and start-up migrations (dbUpsertAppPlaylists) stay unconditional.
- A closed tab's adopted edits replay before this tab's queued ones, from
the base of its first step, so newer progress is not replaced by older.
- A reload or adoption removes the old page load's saved writes only when
this page saved its copy; each closed tab is adopted once per page.
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
