VID-914 fixing preview link logic and doing some style cleanup on the fe...

...atured video form

The main goal was to show the preview link on page load (when there's a large image present, which is effectively always).

I also went in and cleaned up some styles that have been bugging me, like the hint text not being set to the "alternative" color, and some error message spacing. 

Sorry for not breaking this up better between the task code and the cleanup code... I gotta be better about doing that.