triangle #60: surface pattern registry — kin + phrases in drawer, Clusters view

- drawer 'patterns & kin' section: a track's nearest tracks (shared n-gram
  similarity, clickable to jump) + notable phrase chips (↔ shared idiom /
  ⟳ repeated section), click a phrase to filter the table to who else plays it
- Clusters view toggle: connected components of the neighbor graph rendered as
  family cards (members + the shared phrases that bind them) + a distinctive/solo
  roster. 8 families + 54 solos on the real corpus
- pattern_registry.json loaded best-effort alongside catalog_view.json