Pro-Swapper/ProSwapper — reverse-engineered prompt

Build me a Windows desktop app called Pro Swapper for Fortnite. I want it to feel simple and polished, with a clean interface where I can browse cosmetics, see their icons, and swap skins in a straightforward way. It should work with the current Fortnite version, read the game assets it needs, pull things like the AES key and cosmetic data from the Fortnite API, and show any useful BR news inside the app too.

Please make it easy for a normal person to use, with clear buttons, status messages, and sensible error handling if Fortnite is not installed or something changes after an update. If it makes sense, include Discord rich presence support like the original project mentions. Keep it as a C# Windows app on .NET 6, and make sure it is buildable and runnable from the repo. You can look up current docs online if you need to.