Adds bundled preset avatars on top of the monogram foundation.
- New `Avatar` enum (Monogram | Preset(u8)) in the avatar module, serde-encoded;
6 preset PNGs embedded via include_bytes! (placeholder art in assets/avatars/
— swap for real designs later). +3 unit tests.
- `PeerState` gains `avatar` (rides the gossip presence plane like `sharing`);
`AppConfig` gains `avatar` (persisted). Avatar choice flows app → core (Join +
new SetAvatar command) → every self-state announce, so it reaches the room incl.
late joiners, and changing it mid-call re-announces live.
- Settings "Avatar" section: monogram + 6 preset tiles, applied live + persisted.
- Rendering: `avatar_view` draws the chosen preset image (iced `image` feature,
now enabled) else the monogram, in the self card, peer rows, and chat (chat
looks up the sender's avatar from presence by id).
⚠️ BREAKING gossip wire change: presence Announce is signed (S2) and the
signature is recomputed by re-serializing the parsed struct, so a new PeerState
field means old and new builds can't verify each other's presence — ALL peers
must run a build >= this one (same as the S2 change). Redeploy dopedart before
2-machine testing.
Build + clippy clean, 222 lib + integration tests green.
Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
molluskandClaude Opus 4.8
3007002b1b
