Increase Radio Perception - (eg. autoplay stream, visualizer, ...)

[weego]

This is @weego's long time wish; also confirmed by feedback in Class: users didn't understand it's a radio because they didn't see the play button.

[vin-ni]

Ok,
we should look for more prominent way of presentation on the landing page.
And can also rethink the bar at the bottom.
I just realize the planned audio visualizer is not yet implemented. This could also help to increase the perception of it being a radio.

[weego]

Re footer bar:
timer display on the right shd have a leading "Playing since... ".
Some ppl. didn't understand what the timer means.