Improve tiling when there is a call + pinned widget

### Your use case

This is pretty bad:

https://user-images.githubusercontent.com/2803622/153485785-0173fd14-eb0e-40db-b457-78802a75772f.mp4

- timeline?
- widgets have their individual resize handles

#### What would you like to do?
this should easier to handle and more intuitive. the 2 widgets taking up just more than "100%" vertical space is really bad.

spontaneous ideas: these 2 should either
- tile like 2 pinned widgets do
- tile into the timeline area as a fullscreen widget would, with only one separator/handlebar to rezise both at the same time. chat then opens in right panel.
- switch the call to floating mode (i.e. goes to the side) when a widget gets pinned

### Have you considered any alternatives?

_No response_

### Additional context

_No response_