Admin event page: redesign UI, export endpoints, mobile fixes
- 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>
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