Fire a no-await profiles query in AuthContext on session establish to absorb
cold-connection latency before the first user-triggered request. Add
loading='lazy' default to the central Avatar component so all off-screen
avatars (chat list, friends list, popovers, message senders) skip eager
Supabase Storage fetches; set loading='eager' on ConversationHeader (active
conv header) and CallParticipantTile inline imgs (both AudioContent and
VideoStub) which are always above-the-fold when visible.
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
