LLLin000 e0260a8188 feat: recover 'Figure N' heading prefix from PDF text layer for OCR-missed captions ... When PaddleOCR fails to detect a standalone 'Figure N' / 'FIGURE N' heading (rendered in a bold/small-caps font that the OCR engine doesn't read), the caption body is captured as figure_caption_candidate but lacks the figure number prefix. The new _recover_figure_heading_prefix() function checks the PDF text layer (via existing page_pdf_lines_by_page infrastructure — no extra PDF open) and prepends the heading. Key logic: - Scans PDF text lines on the same page for 'Figure N' headings - Confirms by checking if the NEXT PDF line (by y-order) shares ≥15 chars of common prefix with the OCR caption candidate text - Only runs when _extract_figure_number() returns None (no figure number in existing caption text) - Integrated into build_figure_inventory() before _is_formal_legend() check, so recovered captions enter the legend matching pool Fixes 'FIGURE 1' loss in 5S7UI34M and 'FIGURE 5' loss in HQAQBSBP. 372 figure tests pass.		2026-07-03 01:46:40 +08:00
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page4.png	feat: recover 'Figure N' heading prefix from PDF text layer for OCR-missed captions	2026-07-03 01:46:40 +08:00