Drop the DiceBear generated avatar (and dicebear_core/dicebear_styles/
flutter_svg): the default is again a Material coloured-initial disc from
the pubkey. Picking a photo now goes through a square crop step
(crop_your_image — pure Flutter, all platforms incl. desktop, Apache-2.0,
only pulls the image package we already had) before the 24 KB thumbnail.
The picker now offers only a photo; with none, the generated DiceBear
avatar is used. Removes the seedks-ttf illustration row (and the now-dead
avatarGlyphNames/avatarGlyphToken). tane:seed:<glyph> values set before
this still render (avatarGlyphChar kept) for backward compatibility.
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).
