Fix build issues by switching from Google Fonts to local fonts

- Added `geist` npm package for local font files
- Updated layout.tsx to import fonts from the geist package
- Build now succeeds without network access to Google Fonts

Co-authored-by: GTheMachine <156854865+GTheMachine@users.noreply.github.com>

apps/app/package.json

@@ -49,6 +49,7 @@
     "clsx": "^2.1.1",
     "cmdk": "^1.1.1",
     "dotenv": "^17.2.3",
+    "geist": "^1.5.1",
     "lightningcss-linux-x64-gnu": "^1.30.2",
     "lucide-react": "^0.556.0",
     "next": "16.0.7",