- Add X close button on valid ticket screen to dismiss without check-in
- Rewrite QRScanner: full unmount when leaving Scan tab, stop MediaStream tracks
- Remount scanner via key when tab active; no hidden DOM
- Use 100dvh for mobile height; force layout reflow after camera start
- visibilitychange handler for tab suspend/resume
Co-authored-by: Cursor <cursoragent@cursor.com>
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