Timeline Viewer: annotationItems with no overlap should be centered
At the moment all annotation items are aligned to the left. That's ok, but I think in case you do not have any video on your timeline that overlaps with another, it might now look a bit weird that all annotation items align to the left.
If that's possible and does not take too much time, I would suggest to generally align dates and annotationItems to the center and only if there is more than 1 annotation item in one row, to align this row to the left.