Profiles had only a coloured-initial disc. Now each person can set an
avatar — a real photo OR one of our own seed illustrations (so
pseudonymity stays the default; no photo required).
- ui/avatar.dart: the one-string value scheme carried in the kind:0
'picture' — a 'data:' photo thumbnail, a 'tane:seed:<glyph>' token, or
empty. The Nostr ProfileTransport already published 'picture'.
- Photos ride inline as a tiny thumbnail (reuses offerThumbnailDataUri,
24 KB cap) — no media server, like offer photos.
- avatar_edit.dart: pick/take a photo, choose a seed illustration, or
remove; ProfileStore stores it; ProfileScreen shows a big editable
avatar and publishes it.
- PeerAvatar renders photo / illustration / initial fallback.
- ProfileCache gains picture/setPicture; the inbox caches peers' avatars
alongside their names.
- i18n avatar block (en/es/pt/ast). Tests: value scheme + PeerAvatar
render modes, store + cache round-trips.
Follow-up: render peers' avatars in chat/market/your-people (thread the
cached picture into PeerAvatar at each call site).
Closes the profile loop — peers now appear by name, not a raw key.
- ProfileCache: keystore-backed cache of peers' published display names (works
offline) + shortPubkey() fallback.
- Chat: the app bar shows the peer's name (cached first, then freshened from
their kind:0 over the session); falls back to a short key.
- Inbox: each conversation shows the cached name, and missing names are resolved
over one session and cached.
- Wired via DI + TaneApp(profileCache).
Analyzer clean; ProfileCache covered by a plain test.
