Fix CI Build Timeout by Using Local Geist Fonts

[VulcanoSoftware]

I have resolved the GitHub Action failure by switching the frontend font management from next/font/google to the standalone geist package.

The logs showed that the ARM64 Docker build was failing during npm run build because it timed out while attempting to fetch Geist Mono from Google Fonts. By installing the geist package and using it locally, we eliminate this network dependency during the build process.

I have verified the fix by:

1. Running npm run build and npm run lint successfully in the dcfs-gh-pages directory.
2. Visually verifying the frontend using a Playwright script that captured screenshots of the application running with the new font configuration.
3. Ensuring no temporary files (like next_dev.log) are included in the submission.

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PR created automatically by Jules for task 3475021281854471409 started by @VulcanoSoftware

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