The last item in the sidebar top level group has an indicator specified,
the problem in our case is that the structure can be nested and have sub
groups. So selecting the last item correctly can be tricky.
Previous implementation relied on the using DOM queries to find the last
item from a flat list of children, it would trigger on a `watch`. This
was error-prone as well as non idiomatic. The new approach is CSS-only
and reduces the unnecessary compute required.
Codepen for reference: https://codepen.io/scmmishra/pen/yLmKNLW
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Co-authored-by: Sivin Varghese <64252451+iamsivin@users.noreply.github.com>
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