SIDE-BY-SIDE CHAT — Customer (left, blue) + Provider (right, red). iMessage-style bubbles, outgoing red/blue per channel, incoming white with border. Channel tags on each message (SMS/MMS/EMAIL). Typing indicator on customer side. AI-suggested replies (purple strip) above quick actions (pill buttons). Channel toggle (SMS/Email) above compose for customer only — providers are SMS-only. Slash command popover shown on provider side (/ in the input). System events inline (ticket created, status changes). MMS shows photo placeholders.