Fundamentally rearchitect build_cell_grid_v2 to combine the best of
both approaches:
- Broad columns (>15% image width): Use full-page Tesseract word
assignment. Handles IPA brackets, punctuation, sentence flow,
and ellipsis correctly. No garbled phonetics.
- Narrow columns (<15% image width): Use isolated cell-crop OCR
to prevent neighbour bleeding from adjacent broad columns.
This eliminates the need for complex phonetic bracket replacement
on broad columns since full-page Tesseract reads them correctly.
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
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