element-hq/element-x-android ? reverse-engineered prompt

I want an Android Matrix chat app like Element X, a clean modern messenger for Android 7 and up that feels polished and ready to run in Android Studio.

Please use the existing codebase and get the main app building and working, not the sample apps. The app should let someone sign in to a Matrix account, see their rooms, open a conversation, read and send messages, and move around the app with a smooth modern UI. Keep the look and feel fresh and simple, with good support for light and dark mode. It should use the current Matrix Rust SDK integration that is already part of the project, not a separate custom chat backend.

If anything is missing or broken, wire it up in the most straightforward way so the app can actually launch and be usable. Please keep translations and existing project structure in mind. If you need details, check the repo docs and current Matrix or Android docs online, then make whatever fixes are needed to get a solid working build.