Color the weekend background

[Fnordbert]

Checklist

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Feature description

Related to my FR #396 and the previous FR #65
I was happy to discover that there is an option to highlight weekends on some views, however I find that especially in the weekly view with "start on current day" the color on the header is a little discreet, and leads me to have to "hunt" for it in the UI.
This is a much smaller niggle than my FR #396, but especially if that one would be implemented, I would find it natural to also allow the background color of weekends to be shaded in an appropriate color.

Why do you want this feature?

It would improve usability a little, by making it quicker and more intuitive to get oriented in the weekly and possibly monthly view.

Additional information

No response