Blur the screen outside the Rest Break window

[Korb]

I suggest considering adding the ability to enable blurring and reducing the brightness of the image outside the Rest Break window (with user recommendations and a progress bar scale).

This will reduce the temptation to continue working despite the Workrave notification, or will not allow you to read notifications from other applications during a rest break, which will force you to interrupt your rest, thereby violating the work and rest regime.