Show overtime once the timer hits 00:00 #28
Description
In many conferences, even if the time is over, the speaker can conclude or answer questions.
It would be useful to show how much extra time has been granted.
This means : once the timer reaches 00:00, it could continue counting up this time : 00:01, 00:02 ...
It should remain clear that the time is hover so I guess we can keep the red background fullscreen, maybe add a "+" sign in front of the time : +01:30 and a text saying something like "time is over".
If the pause feature is already done, I don't think we should be able to pause the extra time. The action should be to stop the counter.
This behavior should be feature flagged, with an entry in the settings.