SkillMessage

Widget displaying a skill invocation with collapsible body.

Shows skill name, source badge, description, and user args as a compact header. The full SKILL.md body (frontmatter stripped) is hidden behind a preview/expand toggle (click or Ctrl+O). The expanded view renders markdown via Rich's Markdown inside a single Static widget.

Visibility is driven by a CSS class (-expanded) toggled via a Textual reactive var. Click handlers are scoped to the header and hint widgets (_SkillToggle) so clicks on the rendered markdown body do not trigger expansion toggles (preserving text selection, for instance).