How should the unified conversation list + chat area be arranged?
WhatsApp/Telegram style — conversation list on left, active chat on right. Clean and familiar. Works at all screen sizes with sidebar collapse.
Signal-style — conversation list takes full width. Tapping a thread navigates into it (back button to return). Filter tabs for All/AI/People. Maximizes space on mobile.
Narrow avatar strip + chat + contact info sidebar. Dense, information-rich. Shows encryption status, shared files, contact details alongside the conversation.