- Backend: Add /events/:eventId/attendees/export and /events/:eventId/tickets/export with q/status; legacy redirect for old export path
- API: exportAttendees q param, new exportTicketsCSV for tickets CSV
- Admin event page: unified tabs+content container, portal dropdowns to fix clipping, separate mobile export/add-ticket sheets (fix double menu), responsive tab bar and card layout
Co-authored-by: Cursor <cursoragent@cursor.com>