In support-tickets-dashboard.tsx, the ticket list and thread panel are a fixed 50/50 grid on large screens. When a ticket is selected, the thread opens to the right — but there's no way to close the thread panel without selecting a different ticket. There's no 'X' button, no Escape key handler, and no visual affordance that the thread can be dismissed. On medium screens this also clips the thread panel uncomfortably.
Category: usability File: src/components/support-tickets-dashboard.tsx Recommendation: Add a close/dismiss button (X icon) to the ticket thread panel header. Wire an Escape key handler to clear selectedTicketId. Consider making the split resizable with a drag handle, or using a slide-over Sheet for the thread on screens < lg breakpoint, keeping the full list visible on mobile.