parvans/QueueUp ? reverse-engineered prompt

Build me a simple app called QueueUp that helps people join and manage a queue from their phone.

I want it to feel clean and easy to use, with a home screen, a way to add yourself or a new item to the queue, a screen that shows the current order, and basic actions like moving someone up, removing them, or marking them done. Keep the design modern and friendly, and make sure it works well on mobile.

Please set up the project so it runs cleanly from the existing TypeScript app structure, and use sensible default data if needed so I can see it working right away. If you need to check current docs or best practices for the setup, feel free to look them up online first.

Make the code easy to understand, and leave it in a state where I can open the app and test the main flow without extra work.