Improve screensharing experience

[nimishavijay]

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Is your feature request related to a problem? Please describe.
Currently when you share your screen there are 2 problems that come up very frequently:

• The infinite nested Talk screen when the Talk tab happens to be shared

• The "stop screensharing" button is very small and inside another menu, while the "leave call" button is very prominent. As a result many people accidentally leave the call when their intention was to stop sharing their screen. ref #5864
  

Describe the solution you'd like
A better indication that you are sharing your screen and a more prominent "stop screenshare" button
Examples:
Zoom doesn't show your screen in the first place, there is just a hint on top that shows a thumbnail of your screen

Google Meet shows a warning over the infinity screen and a "stop screenshare" button on top

Describe alternatives you've considered
n/a

Additional context
n/a

[nickvergessen]

I'm fine with a red stop screenshare button. But from my last looks at the CallView handling own screenshares differently is a lot of work.

[jancborchardt]

The way how Google Meet does it actually looks quite nice, subduing your own screen initially and showing that message, but you can ignore if you want to show something in the app – or stop presenting more easily.