fix: load OG image fonts from @fontsource/inter instead of Google Fonts

Vercel's build infra was intermittently hitting ETIMEDOUT against
fonts.googleapis.com, causing OG image generation errors during
prerender. Ship the Inter .woff files with the function via
outputFileTracingIncludes so the build is network-free. Also add
turbopackIgnore hints on process.cwd() calls to silence an NFT warning
that was over-tracing next.config.ts into the route bundle.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

package.json

@@ -23,6 +23,7 @@
   },
   "dependencies": {
     "@base-ui/react": "^1.3.0",
+    "@fontsource/inter": "^5.2.8",
     "@mdx-js/loader": "^3.1.1",
     "@mdx-js/react": "^3.1.1",
     "@next/mdx": "16.2.3",