hiddify/hiddify-app ? reverse-engineered prompt

Build me a multi-platform proxy client app that works on everything: Windows, macOS, Linux, Android, and iOS. Use Flutter to build it from a single codebase. The purpose is to give users a secure, private, and ad-free way to access the internet, especially in countries with heavy censorship.

It should be super easy for a non-technical person to use. They should just be able to paste a subscription link from whatever service they use, and the app will automatically import all the server settings. It should also be smart and automatically test the connections to pick the fastest server for them.

The main UI should be clean with a big "connect" button. I'd also like it to show information from the user's subscription, like how much traffic they have left and when it expires. Please include both a light and dark theme. The app needs to support a whole range of modern proxy protocols like Vless, Reality, TUIC, and Wireguard, so it can work with most providers.