Configuration Required
Add the dashboard Firebase environment variables before enabling seller login and Firestore access in Vercel.
Required Variables
`NEXT_PUBLIC_FIREBASE_API_KEY`, `NEXT_PUBLIC_FIREBASE_AUTH_DOMAIN`, `NEXT_PUBLIC_FIREBASE_PROJECT_ID`, `NEXT_PUBLIC_FIREBASE_STORAGE_BUCKET`, `NEXT_PUBLIC_FIREBASE_MESSAGING_SENDER_ID`, and `NEXT_PUBLIC_FIREBASE_APP_ID`.