Alt+* still working during breaks on Ubuntu 24.04

[quwepiro]

Describe the bug
During a break the keyboard is disabled. I cannot type single letters.
But Alt+Tab for example still works, and thus I can tab away from the break screen.

To Reproduce
Steps to reproduce the behavior:

1. Wait for a break
2. Alt+Tab

Expected behavior
All keyboard keys are disabled. That means, there is no way for me to circumvent the breaks anyhow.

Desktop (please complete the following information):

• OS: Ubuntu 24.04
• Desktop Env: Gnome on Wayland
• Version: 2.2.2 installed via PPA and apt

Debug Log
safeeyes.log

[deltragon]

This should be fixed by #651, needs the GTK4 work to be merged first.