MeisApps/pcbu-desktop ? reverse-engineered prompt

Build me the desktop companion app for PC Bio Unlock.

I want a desktop app that lets someone unlock their PC using their Android phone, with the connection working over either TCP or Bluetooth. It should support Windows, Linux, and macOS, but make it clear that macOS is still experimental and not really ready for regular users yet.

On Windows, it should work for the login and unlock screen, plus UAC prompts. On Linux, it should support sudo, polkit, and common desktop environments and display managers like GNOME, KDE, Cinnamon, GDM, SDDM, and LightDM.

Make it feel like a real cross platform desktop utility, with a clean setup flow and the basic pieces needed to connect the phone and manage unlocking. If you need to check current docs or platform details while building it, go ahead and look them up online.