refactor(web): ChatView's subagent, goal, background-work and branch banners are built in ThreadActivityBanners (#22725)

Co-authored-by: Claude Opus 5.5 <noreply@anthropic.com>
bd7aab2c95Julius Marminge committed on 10/21/2026, 8:36:17 AM· committed by GitHubparent030be16
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