fix(web): mod+enter starts a new thread in the background again (#15060)

Co-authored-by: Claude Opus 5.5 (1M context) <noreply@anthropic.com>
263097a8daTheo Browne committed on 10/3/2026, 9:19:11 AM· committed by GitHubparentf68e24f
6 files changedLine totals unavailable