The no-tags QR used line-height centering, which wkhtmltopdf renders slightly
high (extra white at the bottom). Switched to a single-cell table with
vertical-align:middle (same mechanism as the with-tags case) so the QR centers
in its cell with balanced top/bottom margin. Verified live (WO-30072).
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>