fix(fonts): self-host Inter, JetBrains Mono and Caveat

[raferdev]

Summary

• Why: the main deploy after fix(brand): serve the R/ favicon reliably and fix the manifest link #60 failed in next/font/google (Cannot read properties of null (reading '1')). Google Fonts briefly returned a font URL without a .woff2 extension, which Next's loader can't parse. The same commit built fine minutes earlier, and a re-run succeeded, so every build depended on Google answering normally.
• Fix: commit the Latin variable .woff2 of each font (the exact files Google serves) and load them with next/font/local. Builds no longer make any network request for fonts.
• Output: 17 font files across seven subsets drop to 3. The site text only uses Latin characters (→ isn't in any subset we loaded, so it already used a fallback font), and the Latin files are the ones that were already preloaded.
• The OFL license of each font is committed next to the files.

Verification

• Full-page screenshots of all four pages, at 1280px and 393px, light and dark, are pixel-identical to the Google Fonts build.
• Full suite (194 tests) passes against the nginx test container.

🤖 Generated with Claude Code

[changeset-bot]

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[raferdev]

Closing: the font failure was a transient Google Fonts hiccup; the re-run deployed fine.