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Replace the trivial top_y/bottom_y threshold check with horizontal projection gap analysis that finds large whitespace gaps separating header/footer content from the main body. This correctly detects headers (e.g. "VOCABULARY" banners) and footers (page numbers) even when _find_content_bounds includes them in the content area. Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>