- ReadPositionsContext is provided once at Room level so the thread
panel (a sibling of RoomView) gets real positions instead of the empty
default; own thread messages no longer sit on "Sent" forever (#38).
- Receipt events only recompute the users they name, merged into the
previous map with reference equality preserved for untouched rows, so
a receipt no longer re-renders every message (#40). Unit-tested.
Fixes#38Fixes#40
Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01PPmy3tPq869XDW4njjVaKA
