v0.5.3

Added

• Recognize direct "role": "tool" JSON/JSONL message objects for T gutter
  labels, green role guides, role-value highlighting, and structure jumps.

Changed

• Extend the JSON/JSONL S/U/A/T gutter color through each message
  object's visible interior, including wrapped continuation rows, while
  leaving the opening/closing brace rows and objects without a direct role
  neutral. The role letter remains colored on the opening row.

Fixed

• Scroll long wrapped logical lines past the viewport top one visual row at a
  time in either direction instead of jumping between a last-full-page
  position and the next logical line. End-of-file views still clamp to the
  last complete page.
• Resolve chat roles at their actual JSON object depth so nested or following
  sibling roles cannot relabel an outer or role-less message object.