kovidgoyal/calibre ? reverse-engineered prompt

Build me a desktop app for managing ebooks that feels like calibre.

I want to be able to add a library of books, see them in a clean catalog, search and sort them, edit book details, and convert between common ebook formats like EPUB, MOBI, and PDF. It should also let me open and read books inside the app, pull in metadata from the internet, and send books to ebook readers and devices.

Make it work on Linux, Windows, and macOS, and keep it polished enough that it could handle a real personal library. If there are any tricky parts around file formats or device support, look up current docs online if you need to.

Focus on a simple but powerful library view, good import and export flow, and a smooth experience for viewing, converting, and organizing books.