After picking an image, a modal opens with cropperjs's drag-handle
crop UI and Rotate left / Rotate right / Reset buttons. Cropping
to just the text region is the single biggest quality win for
OCR on phone photos — strips out logos, lighting transitions, and
background junk that bleed past the confidence filter.
- Lazy-loads cropperjs + its CSS from esm.sh on first use (no
bundling; same pattern as Tesseract.js and CodeMirror).
- Honours EXIF orientation from phone shots (checkOrientation).
- Keyboard: Esc cancels, Enter accepts. Clicking the backdrop
also cancels.
- Output goes through the existing preprocessForOCR pipeline
(downscale to 1600px + Bradley adaptive threshold) before
Tesseract sees it.
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