refactor(web): the background activity setting and its dialog live in their own file (#22669)

Co-authored-by: Claude Opus 5.5 <noreply@anthropic.com>
381514e7afJulius Marminge committed on 10/21/2026, 8:39:28 AM· committed by GitHubparent501f5c5
2 files changedLine totals unavailable