KDE/kasts ? reverse-engineered prompt

Build me a clean podcast app called Kasts that works well on desktop and mobile, with a simple KDE style interface that feels at home on both. I want people to be able to add podcast feeds, browse episodes, see artwork and details, and play audio smoothly with basic controls like play, pause, skip, and seeking. It should remember where I left off, let me manage my subscriptions easily, and make downloading or keeping episodes available offline feel natural.

Please make it feel polished and responsive, with a nice timeline or library view, and support a modern podcast experience without getting cluttered. If you need to look up current KDE or Kirigami docs online while building it, go for it. Use the project’s existing branding and make sure it feels like a real app someone could actually use on Linux and Android.