Files
amethyst/quartz/src
Vitor PamplonaandClaude Opus 5 8df98c34df feat(buzz): say who joined and what changed in the kind-40099 system lines
The in-chat markers read "member joined" / "visibility changed" — the relay's
raw payload type with the underscores swapped for spaces. Everything that makes
the line useful was parsed and then dropped: which member, who added them, and
what the setting changed TO.

Render the full sentence from the signed payload instead, with the pubkeys
resolved to the names the viewer knows them by and the avatar of whoever the
line is about:

  member joined      -> "Shawn was added by straycat"  (actor != target)
                     -> "Vitor joined"                 (self-join, actor == target)
  member removed     -> "Bob was removed by Alice"
  visibility changed -> "straycat made this channel open — anyone can find and join it"
                     -> "... made this channel private — invite only"
  ttl changed        -> "Alice set messages to disappear after 7 days" / turned off
  topic/purpose      -> the new value, or "cleared the topic" when blank
  channel created/deleted/archived/restored, message deleted (+ public reason),
  dm created         -> named after their actor

The event is signed by the RELAY keypair, so the people come from the payload's
actor/target, never from note.author. Membership lines are about the member, so
that is whose avatar shows and whose profile the pill opens; everything else is
about the actor.

Also covers the neighbouring timeline narration, which had the same problem:
huddle joins/leaves now name the participant from the `p` tag instead of
"someone joined the huddle", job lines name the signer, and forum votes name
the voter. All of these move from hardcoded English into string resources.

Quartz's SystemMessagePayload was missing target_event_id, action_id,
reason_code, public_reason and participants — every field of the moderation
tombstone and the DM-created payload. The KDoc now carries the complete
vocabulary read off the relay's emit_system_message callers, and the type
strings are constants so the UI cannot typo a branch into dead code.

An unknown type still renders as "alice: some_new_type" rather than vanishing,
so a relay that grows new vocabulary stays legible.

Verified on emulator-5554 against nosfabrica.communities.buzz.xyz: the four
"was added by" lines, "straycat created this channel", "Matthias Debernardini
joined" and "straycat made this channel open" all render with the right subject
avatar, in the chat and in the Messages-list preview.

Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>
2026-07-26 18:19:01 -04:00
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