Mobile scanner redesign + backend live search
- Scanner page: fullscreen mobile-first layout, Scan/Search/Recent tabs - Scan tab: auto-start camera, switch camera, vibration/sound feedback - Valid/invalid fullscreen states, confirm check-in, auto-return to camera - Search tab: live backend search (300ms debounce), tap card for detail + check-in - Recent tab: last 20 check-ins, session counter - Backend: GET /api/tickets/search (live search), GET /api/tickets/stats/checkin - Admin layout: hide sidebar on scanner page; fix hooks order (no early return before useEffect) - Back button to dashboard/events (staff → events, others → admin) - API: searchLive, getCheckinStats, LiveSearchResult; PostgreSQL LOWER cast for UUID Co-authored-by: Cursor <cursoragent@cursor.com>
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