Right-side thread drawer (MembersDrawer pattern; mobile fullscreen):
- ThreadPanel: header + close/Escape, ThreadTimeline, its own RoomInput
(threadRootId prop; drafts/replies/uploads isolated per roomId::threadId;
schedule + slash-commands off in threads v1) and threaded mark-as-read.
- ThreadTimeline: lean reimplementation over thread.liveTimeline — copied
useTimelinePagination pattern (/relations back-pagination + decryption),
virtualized, root event emphasized + "N replies" divider, reactions/edits/
redactions, and a pending strip (chronological local echo never enters the
thread timelineSet — rendered from LocalEchoUpdated instead).
- ThreadSummary chips on root messages (server-aggregated bundle or live
Thread; unread badge via getThreadUnreadNotificationCount) keep threads
discoverable now that replies leave the main timeline.
- Reply-in-Thread menu + thread indicators open the panel; deep links to
thread events redirect into it.
- State: roomIdToActiveThreadIdAtomFamily + getThreadDraftKey (+18 tests).
Gates: tsc clean, eslint 0 errors, build OK, 616/617 tests (1 IDB skip).
Awaiting live QA; release note: threaded replies no longer render inline.
Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
