burakorkmez/grocify-expo ? reverse-engineered prompt

Build me a grocery list mobile app that works on both iPhone and Android.

I want users to sign in with Google, Apple, or GitHub, then manage their groceries in a simple, polished app. There should be a list screen where people can add items, mark them as purchased, change quantities, delete items, and clear completed items with one tap. I also want a planner screen for adding new grocery items, plus an insights screen that shows profile info and basic analytics.

Make it feel modern and easy to use, with a nice tab bar and clean styling. Please wire it up to a real backend with persistent data storage, using a PostgreSQL database and type safe queries. If you need current setup details for the mobile and auth pieces, look up the latest docs online before implementing. Also include a feedback button for user suggestions and bug reports, and make sure logout works securely.