Usability of html visualization

[siarheiyelin]

Is your feature request related to a problem? Please describe.
It's related to usability issues of html visualization in some cases:

• Use case 1. Let's say we have a complex bundle structure. When some nested block is hovered, then a gray background is added to the hovered block as well as to all its parents. As a result, it's difficult to see which block exactly is hovered.
• Use case 2. When any nested block is clicked, then it gets enlarged and there is no way to see all parents of this block. It would be nice to have some breadcrumb at the top.

Describe the solution you'd like

• Solution for the use case 1: It would be very helpful to add a different background and/or border color directly to the highlighted block. So that it can be distinguished from its parent blocks.
• Solution for the use case 2: Add clickable breadcrumb at top of the page. E.g., such breadcrumb is implemented in "bundle-wizard": https://bundle-wizard-spectrum.netlify.app/#