Replace external <link> to fonts.googleapis.com with next/font/google
for Cormorant Garamond and Inter. Fonts are now built-time downloaded
and served from /_next/static/media, exposed via --font-serif and
--font-sans CSS variables that Tailwind's fontFamily reads.
Eliminates runtime dependency on Google Fonts CDN (helpful for offline
or region-restricted deploys), avoids FOUT through next/font's
size-adjusted fallback, and removes two render-blocking external
stylesheet requests on first load.
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>