sinkclose/Xenon ? reverse-engineered prompt

Build me the Xenon Android app, a third party Telegram client based on Telegram for Android with a few useful tweaks. I want it to feel like a normal Telegram app at first, but with Xenon branding, the custom changes from this project, and the same single stable app id.

Please make it build and run cleanly in Android Studio, and set things up so I can add my Telegram API id and hash in local properties, plus Firebase messaging if needed. Keep the app working as a real Telegram client, with the usual login, chats, media, and settings flow, and include the fork specific strings and any custom behavior already expected by this project.

If anything is unclear from the existing code or docs, look up the current Telegram Android and API docs online and then finish the implementation in a way that matches this repo.