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When OCR merge expands a prefix word box (e.g. "zer" w=42 → w=104),
it heavily overlaps (>75%) with the next fragment ("brech"). The grid
builder's overlap filter previously removed the prefix as a duplicate.
Fix: when overlap > 75% but both boxes are alphabetic with different
text and one is ≤ 4 chars, merge instead of removing. Also enable
chain merging via merge_parent tracking so "zer" + "brech" + "lich"
→ "zerbrechlich" in a single pass.
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>