- Scan button is now a 📷 floating action button at bottom-right
of the viewport (camera emoji per explicit request). Replaces
the small "Scan image" button in the input header.
- Crop modal: inner padding on .modal-body so cropperjs's
bottom-right corner handle isn't on top of Android's edge-swipe
back-gesture zone. Backdrop also respects iOS safe-area insets
(env(safe-area-inset-{right,left,bottom})).
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