Seeing other participants live (ADR 0003/0004, realtime-collaboration.md
§Awareness):
- The collaboration-caret extension renders remote carets and selections
with a name flag and a per-user colour. Colours come from a small,
hand-picked palette hashed by user id (FNV-1a), so they are stable across
sessions; a unit test asserts each palette colour clears WCAG AA contrast
(4.5:1) against the white label text.
- A presence strip at the top of the page shows an avatar (initials) per
connected participant, deduplicated by user id, with an overflow count.
Read-only participants appear in the strip (with a marker) but broadcast
no caret — the caret render suppresses read-only users — so the same
awareness feed drives both cursors and presence. Own identity (id +
display name) comes from the auth context into the awareness `user` field.
- Presence updates on every awareness change, so a disconnect drops the
participant within seconds.
The collab e2e pack gains a test: two browsers see each other in the
presence strip, one participant's named caret appears in the other's editor,
and disconnecting removes them. Validated locally against the full stack.
de + en strings and cursor/presence styles added.
Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01PGdhRiwU1WRL4XxJfZYipY
