Description of a category item does not change color on selection

[begedin]

Problem

From #1079 (comment)

The description text is always using the $text--light (#666) color and does not switch to $default-color (#08A8FC when selected.

The PR introduced a minor bug. The iconClass is bound to the icon element alone and nothing is bound to the p element which holds the description. That means that the p.selected style can no longer apply.

The component itself should be bound to the iconClass class property and styles should be rewritten so they apply to both the icon and the p element.