libretro/RetroArch ? reverse-engineered prompt

Build me a polished RetroArch style app that acts as a frontend for libretro cores, so I can launch games and emulators from one place.

I want a clean menu driven interface with controller friendly navigation, basic touchscreen support, and a command line way to launch content too. It should let me load cores, browse playlists, manage saves and save states, change input settings, and tweak video and audio options. If it makes sense, include support for shaders, rewind, runahead, recording, and core specific settings since those are big parts of RetroArch.

Make it feel solid on desktop first, but keep it portable and easy to adapt across platforms. Use the existing project structure where possible, and if you need current setup details or docs, look them up online before changing anything.