Separate click actions

The original version of the lib had, one click action for both the circle and the text, so we hooked up first the external link and the update of the breadcrumb as well, so all 3 ( Open/ Close , Open link in a new tab, update breadcrumb ) The link already got separated out into a new icon, and the click action was limited to the circle itself only.
Next step should be move the breadcrumb update to the text, so the full list of click actions would be.
- `link` icon ( pop up new page to the hyperlink attribute )
- text ( update breadcrumb )
- circle ( open / close )

Start by locating the visualization click handlers that currently distinguish the link icon and circle, then trace how the text click updates the breadcrumb. Confirm the three target behaviors described in the issue: the link opens the hyperlink, text updates the breadcrumb, and circle opens or closes the node.

Written by the indexing model from the issue text.