~x-ai/grok-latest → B (3:1)

B fixes a real concurrency hazard by precomputing room_members_section_markup and dropping the Tokio RwLock read guard before layout/HTML stringify, avoiding reader stall behind writers during ingest. A is a worthwhile DOM/action unify of public vs room new-thread forms, but mostly structural dedup and selector renames without the same correctness impact.