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On folder selection, filter out duplicate files before conversion: - First pass: same basename → skip (same filename in different subdirs) - Second pass: same SHA-256 hash → skip (identical content, different path) Duplicates are excluded from the convert queue and shown as a warning in the summary with reason (same name / same content). Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>