Spesa mode banner:
- Tracks each added product in _spesaSession[]
- Shows a rotating stat/phrase below the title: count, top category,
duplicates, fun milestone messages (primo prodotto, ottimo ritmo, spesa epica…)
- Banner gains two-line layout (title + stat)
Scan zoom:
- Small pill button 'x1'/'x2' overlaid top-right of the camera viewport
- On hardware-zoom capable devices (Android Chrome) uses track.applyConstraints zoom
- Falls back to CSS scale(2) on video element for all other browsers
- Zoom resets to x1 on stopScanner()
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