Add mutter property check rather only relying on XDG_SESSION_DESKTOP …

[echu2013]

Add support to gnome-shell +v48 on Ubuntu 25.04 and probably others as well

[gemini-code-assist[bot]]

Summary of Changes

Hello @echu2013, I'm Gemini Code Assist[^1]! I'm currently reviewing this pull request and will post my feedback shortly. In the meantime, here's a summary to help you and other reviewers quickly get up to speed!

This pull request enhances the turn-off-monitors script's ability to function correctly in modern Gnome-Shell environments, particularly those utilizing Wayland. By adding a direct check for mutter display configuration properties, the script can now reliably detect and interact with Gnome's display management, ensuring broader compatibility beyond just relying on the XDG_SESSION_DESKTOP variable.

Highlights

• Enhanced Gnome-Shell Compatibility: The script now supports newer Gnome-Shell versions (v48+) on Ubuntu 25.04 and potentially other distributions by checking for mutter property support.
• Improved Wayland Environment Detection: A new check has been introduced to determine if org.gnome.Mutter.DisplayConfig's PowerSaveMode property is available via busctl, providing a more reliable way to identify compatible Gnome Wayland environments.

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