uowuo/abaddon ? reverse-engineered prompt

Build me a desktop Discord client that feels fast and native, not Electron, using C++ and GTK 3. It should let me log in, browse servers and channels, send and read normal chat messages, replies, embeds, images, emojis, and threads, and also handle voice chat. I want the usual useful Discord stuff too, like DMs and group DMs, user profiles, unread and mention indicators, status changes, notifications, and basic server moderation tools like kicking, banning, role editing, invites, audit log, and emoji management.

Make it highly customizable, especially the look and feel, so I can style it with my own CSS or theme. It should work across Linux, Windows, and Mac if possible, and include the needed resource files and config support so it runs cleanly after building. If you need current setup details or library docs, look them up online as needed.