- Agent messages: avatar outside left (matching feed items alignment),
always shown, consistently uses icon avatar instead of initials
- User messages: avatar outside right, action bar moved below the
gray bubble, gray darkened to bg-muted
- System events: right-aligned when actor is the current user
- Run messages: use agent icon avatar consistently
- Pass actorType/actorId in event metadata for current-user detection
Co-Authored-By: Paperclip <noreply@paperclip.ing>