chopperdanielrus/FortniteAimbotXpert ? reverse-engineered prompt

Build me a simple desktop app for Fortnite practice that helps me improve my aim without cheating.

I want a clean tool with a friendly interface where I can adjust aim sensitivity, choose different crosshair styles, and turn on an optional target practice overlay for training. It should also include a basic recoil control demo for learning, a shot timing helper, and a way to test my mouse settings so I can find what feels best before I play. Make it work on Windows, macOS, and Linux if possible, and keep it easy to open and use.

Please set it up so the controls are obvious, the settings are saved, and I can switch features on and off quickly. If you need to check current docs or libraries online, go ahead.