Activity view: implement day switcher in sidebar

[manuelmeister]

Create a day switcher in the activity sidebar.

Closes #3963

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[BacLuc]

Looks very cool.
i don't know if we need to add a scroll possibility for small tables yet.

[pmattmann]

I like the idea - and the sketch is good. It's better than no DaySwitcher.

At the same time, I'm not sure if it could be better

• If a camp has a lot of days, you can't select the last days (see HarryPotter)
• I'm not sure if you're happy with the aesthetics yourself

[BacLuc]

You need to merge devel again after #4136

[manuelmeister]

@pmattmann thanks for the review. I agree with the overflow. However what do you mean with the aesthetics?

[pmattmann]

@pmattmann thanks for the review. I agree with the overflow. However what do you mean with the aesthetics?

I'll give it a try:
I think I only found the DaySwitcher because that's what the PR is called. The GUI alone doesn't make it clear that you can click there.
And I think I find the gray circles strange. It took me a moment to understand that it was the tag numbering.