Timeline Viewer: visually distinguish annotations that refer to video
I know that the Timeline Viewer is so far only a rudimentary version of what you want to implement. I have only noticed with the current version that it is not really understandable at the moment that the video on the timeline has a duration and the subsequent annotations overlap with this duration, i.e. they refer to the same time and thus to the video. But if it's about what's going to be addressed next, I think that would be extremely helpful (for the beta).