hrydgard/ppsspp ? reverse-engineered prompt

I want you to build a fast, portable PSP emulator app like PPSSPP that runs on desktop and mobile, with a clean interface for browsing games, loading ISOs and homebrew, and playing without needing a BIOS file. It should support save states, controller input, touch controls on phones, and solid default settings so people can just open a game and play.

Please make it feel polished, with good compatibility, basic graphics options like upscaling, and simple settings for audio, controls, and display. If it helps, look up current docs online for any platform specific details or build steps. I also want the app to be easy to test and run locally, with clear instructions for building on Windows, macOS, Linux, Android, and iOS.