leiurayer/downkyi ? reverse-engineered prompt

Build me a simple desktop app that helps me download videos I’m allowed to save for offline viewing from Bilibili, with a clean Chinese interface and an easy login flow if needed. I want to paste a video link, see the available quality options, pick one, and download it with a progress bar, pause and resume, and a basic download history. If subtitles or captions are available, let me save those too, and keep the file names organized so the downloads are easy to find later. Please make it feel like a practical tool for everyday use, not something complicated. If you need to check the latest docs or APIs for anything, look them up online.