feat(template): themed blockquotes, references, chapter-based numbering for textbook

- Add themed blockquote styles (课堂小实验, 关键洞察, etc.) via quote block
- Add #references() wrapper for bibliography formatting
- Implement chapter-based figure/table numbering (1-1, 2-1, ...)
- Start each chapter on a new page (except first)
- Increase list spacing to match long-form reading rhythm
- Fix first-line indent to apply on all paragraphs

templates/md-to-pdf/textbook/template.typ

@@ -5,6 +5,51 @@
 #import "@preview/codly:1.3.0": *
 #import "@preview/showybox:2.0.4": showybox
 
+// ── helpers ──────────────────────────────────────────────────────────────
+
+#let content-to-string(content) = {
+  if content.has("text") {
+    content.text
+  } else if content.has("children") {
+    content.children.map(content-to-string).join("")
+  } else if content.has("body") {
+    content-to-string(content.body)
+  } else if content == [ ] {
+    " "
+  } else {
+    ""
+  }
+}
+
+// ── blockquote themes ────────────────────────────────────────────────────
+
+#let blockquote-themes = (
+  ("课堂小实验", rgb("#F0FDF4"), rgb("#16A34A")),
+  ("关键洞察",    rgb("#FFFBEB"), rgb("#D97706")),
+  ("工程警示",    rgb("#FEF2F2"), rgb("#DC2626")),
+  ("前沿瞭望",    rgb("#F3E8FF"), rgb("#9333EA")),
+  ("历史视角",    rgb("#FEF3C7"), rgb("#B45309")),
+  ("你知道吗",    rgb("#ECFEFF"), rgb("#0891B2")),
+)
+
+#let themed-blockquote(body) = {
+  let body-str = content-to-string(body)
+  let theme = blockquote-themes.find(t => body-str.contains(t.at(0)))
+  let (fill-color, stroke-color) = if theme != none {
+    (theme.at(1), theme.at(2))
+  } else {
+    (rgb("#F1F5F9"), rgb("#64748B"))
+  }
+  block(
+    fill: fill-color,
+    stroke: (left: 4pt + stroke-color),
+    inset: (x: 14pt, y: 10pt),
+    radius: (right: 4pt),
+    spacing: 1.2em,
+    body,
+  )
+}
+
 #let primary   = rgb("#1F4E79")
 #let secondary = rgb("#2C3E50")
 #let accent    = rgb("#3467A8")
@@ -92,6 +137,20 @@
   table(..new_children, ..kwargs)
 }
 
+// Reference-list block: smaller text, hanging indent, tighter rhythm.
+// Wrap a 参考文献 / References section's body via `#references[ ... ]`.
+#let references(body) = block({
+  set text(size: 9.5pt)
+  set par(
+    justify: true,
+    leading: 0.7em,
+    spacing: 0.6em,
+    first-line-indent: 0pt,
+    hanging-indent: 1.5em,
+  )
+  body
+})
+
 #let textbook(
   title: none,
   subtitle: none,
@@ -124,7 +183,7 @@
     justify: true,
     leading: 0.86em,
     spacing: 1.2em,
-    first-line-indent: 2em,
+    first-line-indent: (amount: 2em, all: true),
   )
 
   show: codly-init
@@ -140,12 +199,29 @@
   show: great-theorems-init
   set heading(numbering: "1.1")
 
-  // Same 11pt body as default: match list rhythm to default template
-  set list(indent: 1.2em, body-indent: 0.45em, spacing: 0.62em)
-  set enum(indent: 1.2em, body-indent: 0.45em, spacing: 0.62em)
+  // 按章编号：每章开始时重置图片/表格计数器
+  set figure(numbering: (..nums) => {
+    let h = counter(heading).get()
+    let ch = if h.len() > 0 { h.first() } else { 1 }
+    numbering("1-1", ch, nums.pos().first())
+  })
+
+  // List rhythm: spacing ≥ leading (0.86em), slightly looser than body for long-form reading
+  set list(indent: 1.2em, body-indent: 0.45em, spacing: 0.98em)
+  set enum(indent: 1.2em, body-indent: 0.45em, spacing: 0.98em)
+
+  // 每章从新页开始（第一章除外，因为前面已有 pagebreak）
+  let first-chapter = state("first-chapter", true)
 
-  // Vertical rhythm matches manual (long-form); font sizes differ
   show heading.where(level: 1): it => {
+    counter(figure.where(kind: image)).update(0)
+    counter(figure.where(kind: table)).update(0)
+
+    context if not first-chapter.get() {
+      pagebreak()
+    }
+    first-chapter.update(false)
+
     v(1.45em)
     text(size: 18pt, weight: "bold", fill: primary, it)
     v(0.55em)
@@ -163,6 +239,9 @@
     v(0.4em)
   }
 
+  // Blockquote → themed block
+  show quote.where(block: true): it => themed-blockquote(it.body)
+
   set page(
     paper: "a4",
     margin: (top: 2.5cm, bottom: 2.5cm, left: 2.5cm, right: 2.5cm),