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Your avatar is your photo, picked from the device by tapping it on Home or from a new Profile photo row in Settings, shrunk to 256 px and kept on the phone (there is no upload endpoint yet). Group members show the photo the server sends in a new `photo` field, everywhere avatars appear. Without a photo, an initial on a neutral disc. Mock mode bundles free Unsplash portraits for the sample people. Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_01KhQh614DMeYoQEH9SoMRUw