jfr3000/drip ? reverse-engineered prompt

Build me an open source menstrual cycle tracking app that keeps everything on the phone, with a clean and friendly experience for tracking periods and fertility awareness.

I want users to be able to log cycle related events like bleeding, symptoms, and other fertility notes, then see their cycle history, predictions, and helpful status insights in the app. Make it feel private first, simple to use, and suitable for everyday use. The app should work well on Android, and if it’s practical, keep the structure ready for iOS too since this project uses React Native.

Please include the main screens for tracking, viewing past entries, and basic settings, and make sure the data is stored locally instead of relying on an account or cloud sync. Keep the UI polished and accessible, and use sensible defaults so someone can start using it quickly. If you need to check any current docs or best practices while building, look them up online.