overtake/telegram ? reverse-engineered prompt

Build me a working macOS Telegram app from this codebase.

I want to be able to open the project, compile it, and run the desktop client on my Mac without having to dig through a bunch of old setup issues. If there are any missing pieces or outdated dependencies, please clean those up as much as possible and make the app build again with the current tools. Keep it focused on the existing Objective C Telegram for macOS app, and preserve the current behavior as much as you can.

If something is too old to work exactly as is, make the smallest reasonable fixes and tell me what changed. Also make sure the project opens cleanly in Xcode and the main app launches successfully. If you need to check current docs or compatibility details online, go ahead and do that.