Handle edgecases

[boreq]

I'd see two situations where it would be good to handle errors:

• the stream ends and we can see based on the icecast endpoint that it was actually turned off -> redirect user back to home page
• the stream ends and we can see based on the icecast endpoint that it is actually still running -> restart playback (maybe e.g. we switched from wifi to mobile internet)
• archive is being played and the stream comes online -> switch to live mode
• let me pause? this is covered by the volume slider, I just sometimes need to pause becuase of work calls etc and it was annoying to mute the tab
• give me playback controls on mobile?