refs #23543 [finc] vf7 template revision addendum

* removes role from <nav> container (role of nav is always 'navigation')
* styles similar items carousel
** adds carousel-control focus background variable
** adds border radius variable for similar items carousel
* corrects staffviewAi: corrects error thrown when staff view was called from record view sidebar
* adds comment to fincMissing/record-icon
* adds comment to fincMissing/record-icon
* Fixes role=menu and menuitems