Add a reactive `useMemberAvatar(room, userId, w?, h?, resize?)` hook
returning { name, avatarUrl }, standardizing the member name + avatar
trio and the RoomStateEvent.Members reactivity pattern (N6). Convert
ReadReceiptAvatars and EventReaders to render per-user avatars via a
small child component using the hook, preserving exact sizes, fallback
rendering, TDS pill/tooltip styling and behavior.
Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
jaredandClaude Opus 4.8
e545706c3b