Remove google-translate dep, upgrade firebase-admin, pin csv-parse, and improve processUsers.js

- Remove @iamtraction/google-translate (and undici vulnerability) — translation
  no longer needed, language files now copy English content directly
- Upgrade firebase-admin from ^12.0.0 to ^13.8.0
- Pin csv-parse to ~5.5.0 to avoid major version bump
- Use networkidle2 + 2s delay in processUsers.js for reliable screenshots

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

package.json

@@ -117,7 +117,6 @@
   "dependencies": {
     "@headlessui/react": "^2.2.10",
     "@heroicons/react": "^2.2.0",
-    "@iamtraction/google-translate": "^2.0.1",
     "@tailwindcss/forms": "^0.5.11",
     "commander": "^14.0.3"
   }