Feature that highlights the alert to which each classification corresponds, by hovering the mouse over the classification evolution bar

[Miguel-LlamasLanza]

When checking an object in the science portal, there is a bar of classifications given for each alert, shown on top of the lightcurve.
When hovering the mouse over each alert, we can see the date, but it is not straightforward to find the corresponding alert. Some feature that highlights the alert directly on the lightcurve (e.g. increase the data-point in size with some contour or draw a vertical line at the time of the alert) could be useful.