Lectern v2.6.0

Added

• Copy the concept map: the map sheet gains a Copy button with two
  formats. Outline produces Markdown with each concept's relations nested
  beneath it, so RemNote, Notion, and Obsidian turn them into child items
  rather than a flat wall of text. Diagram produces a Mermaid graph that
  renders in the same apps without a plugin, with importance carried in the
  node shape as well as the colour so the ranking survives renderers that
  ignore styling.

Changed

• The concept list reads like the outline it exports: section headings
  stay put while their group scrolls and carry a count, each concept's
  relations sit beneath it in the same wording the export uses, and
  difficulty is a three-rung meter instead of the word "foundational"
  repeated down every row.
• Page references in the list no longer wrap mid-row: they read "p. 12, 13,
  14" with the overflow collapsed into a "+2" and the full list in the
  tooltip.