feat(cph): add outline export command

render/lib.typ

@@ -242,3 +242,57 @@
     }
   }
 }
+
+/// Render a teacher-facing outline. `children` is intentionally separate from
+/// the lesson body: each node heading is accompanied by an optional planning
+/// note rendered as a visually distinct teaching-tip box.
+#let _render-outline-node(node, level) = {
+  let title = node.at("title", default: "")
+  let kind = node.at("kind", default: "")
+  heading(level: level)[#title]
+
+  if kind != "" {
+    block(
+      inset: (x: 0.35em, y: 0.1em),
+      fill: gray.lighten(80%),
+      radius: 0.2em,
+      text(size: 9pt, fill: gray.darken(30%))[#kind],
+    )
+  }
+
+  let notes = node.at("notes", default: none)
+  if notes != none and notes != "" {
+    block(
+      width: 100%,
+      inset: (x: 1em, y: 0.7em),
+      fill: rgb("#fff8e7"),
+      stroke: rgb("#e6c45a") + 0.6pt,
+      radius: 0.3em,
+      breakable: true,
+      {
+        set text(size: 10.5pt)
+        text(weight: "bold")[教学提示]
+        linebreak()
+        notes
+      },
+    )
+  }
+
+  for child in node.at("children", default: ()) {
+    _render-outline-node(child, level + 1)
+  }
+}
+
+/// Render the outline document supplied by `cph outline --format pdf`.
+#let render-outline(outline) = {
+  let title = outline.at("title", default: "课程大纲")
+  let authors = outline.at("authors", default: ())
+  set document(title: title, author: authors)
+  show: base-style.with(heading-numbering: default-heading-numbering)
+
+  title-block()
+  subtitle-block([课程大纲])
+  for child in outline.at("children", default: ()) {
+    _render-outline-node(child, 1)
+  }
+}