This implements 2 main optimizations: a new NodeRepresentativeList component to share common calculations, and I reduced the DOM nodes it takes to represent a node from 16 to 7.

To reduce DOM nodes, I inlined RepresentativeNode into RepresentativeNodeWrapper.

This also fixes some minor issues:

• The accent color used to shine through.
  
• Since the old method used outline, dragged node representatives didn't have a border.
  
  
• Text ellipsis works now.