Remove the "via Bar" instance → family edge

Remove the "via Bar" instance → family edge

The dashed light-purple arrow connecting an instance to a referenced
type family was visually opaque — readers couldn't tell what
relationship it depicted. Drop it from addFamilyLinksFromArgs along
with its cytoscape style rule and the help-legend row.

The fam-instance nodes the function surfaces and the fam-resolves
chain edges remain — those are the meaningful continuations from the
matched-superclass-instance node.

Co-Authored-By: Claude Opus 4.7 (1M context) <[email protected]>