Mixpanel

1. Create a project in the Mixpanel dashboard.
2. Open Project settings → Access keys and copy the Project Token.
3. Paste it in .env.local:

EXPO_PUBLIC_MIXPANEL_TOKEN=your-project-token

4. Enable the flag in src/config/features.ts:

mixpanel: true,

Init is initializeMixpanel() in src/lib/mixpanel.ts, called from src/app/index.tsx. After sign-in, identify with the Firebase UID — never use email as the Mixpanel distinct id.