make notification_color_hover specific to hovering the notification

[Mariusthvdb]

experimenting with some other custom elements (additional buttons created via UIX-Broker) in the sidebar, I really only now noticed and realize that the notification_hover_color option is activated by hovering any spot on the sidebar-item, and not only by hovering the actual notification badge.

Id love to have it activate only on that notification badge, so hope some styling option can be arranged
preferably in a dedicated config option, or, if not, in some styling option in the styles block.

I have this in my global options

notification_color: rgba( from var(--custom-sidebar-notification-text-color) r g b / 0.05) # override the default HA notification color
notification_color_hover: rgba( from var(--custom-sidebar-notification-text-color) r g b / 0.2)

and obviously set a color on each individual sidebar item

fwiw, I also tested the notification_hover_color on a single item, and took it out from global, but that is identical, so no issue there, as that is expected.

result (including the custom buttons):

hence the FR to add an option for the notification badge hover only

additional concept:
as you can see above,currently the hover does Not activate on a selected item, which feels a bit weird. maybe think about that while looking at notification hover

closer look: selecting the middle item Huis info highlights correctly, but then never hovers the notification badge