Benjamin Admin 9da45c2a59 Fix false header detection and add decorative margin/footer filters ...

- Remove all_colored spanning header heuristic that falsely flagged
  colored vocabulary entries (Scotland, secondary school) as headers
- Add _filter_decorative_margin: removes vertical A-Z alphabet strips
  along page margins (single-char words in a compact vertical strip)
- Add _filter_footer_words: removes page numbers in bottom 5% of page
- Tighten spanning header rule: require ≥3 columns spanned + ≤3 words

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

2026-03-18 10:38:20 +01:00

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