v2.1.31 — Readable, configurable reference previews

Highlights

Reference previews at the size you want

• \ref, \eqref, and \cite hover previews are no longer forced into a
  fixed 13px font. At the default 100%, they use the configured document font
  size as a floor and follow zoom when the page is enlarged, while retaining
  the existing viewport bounds and overflow behavior.

• Config → Viewer config → Hover preview size (%) now lets users choose
  100–300%. The equivalent TOML setting is:

  [viewer]
  hover-preview-scale = 150

  Changes apply live. An already-open preview resizes and repositions to stay
  inside the viewport, and inherited values are not copied into another config
  scope unless edited.

Live-update compatibility

WebSocket protocol 76 → 77 carries the new viewer-config field. Stale tabs
reload once to adopt it, then continue receiving configuration changes live.

Prebuilt mathpreview-cli archives for macOS and GNU/Linux (arm64/x86_64), plus SHA-256 checksums, are attached below.