Replace Pixelify Sans with Block Blueprint as the heading font (theme.headFont).
Block Blueprint isn't on Google Fonts, so it's vendored straight from 1001fonts
(License: 1001Fonts Free For Personal Use — fine for this private friends'
server) as a TTF, with a hand-written @font-face appended to fonts.css. The
vendor step is added to fetch-fonts.sh (runs after the Google rewrite so it
survives re-runs). Pixelify stays available as a HEAD_FONTS option + the
hard-coded fallback.
Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
