Both kombi OCR functions wrote word_result to DB but not to the
in-memory cache. When detect-structure ran next, it found no words
and passed an empty list to graphic detection, making all word-overlap
heuristics ineffective. This caused green text words to be wrongly
classified as graphic regions.
Also adds a fallback in detect-structure to use raw OCR word lists
if cell word_boxes are empty.
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
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