cth103/dcpomatic ? reverse-engineered prompt

Build me a desktop app for making DCPs, the kind you can use to turn a movie file into a digital cinema package for screening.

I want a clean interface where I can import video and audio, set basic project details, choose output settings, and generate a DCP without having to know the technical stuff. It should feel like a real production tool, with progress feedback, error messages that make sense, and support for saving and reopening projects.

If there are any tricky parts or current best practices for DCP creation, look up the latest docs online if you need to. Keep it practical and reliable, and make sure the app can actually build and run from the repo as a working project.