v0.1.3 - TOC polish

Changed

• Tighter TOC widget: line-height drops from 1.7 to 1.35 for a
  proper terminal feel.
• Each TOC entry now truncates with an ellipsis when longer than the
  sidebar (previously either clipped silently or wrapped and broke
  the tree alignment - both inconsistent).
• TOC anchors carry a title= attribute so the full heading text
  surfaces on hover for truncated entries.