Firebase Setup Required — prices won't sync across devices until this is done

1. Go to console.firebase.google.com and click Add project
2. Enter any project name (e.g. arora-sweets), click through and create the project
3. In the left sidebar click Build → Realtime Database → Create Database
4. Choose any location and select Start in test mode → Enable
5. Copy the Database URL shown at the top (looks like https://arora-sweets-default-rtdb.firebaseio.com)
6. Go to Project Settings (gear icon) → Service Accounts → Database Secrets → click Show → copy the secret
7. Open the file js/firebase-config.js and paste the URL into dbUrl and the secret into secret
8. Save the file, deploy/upload your site, then refresh this page