fix: handle latex equations when rendering typst

src/export/typst/templates/answer-sheet.typ

@@ -12,6 +12,8 @@
 // templates/typst.yaml under `extra` rather than editing the geometry here, and
 // check one printed page against your scanner before running a class through it.
 
+#import "@preview/mitex:0.2.7": mi
+
 // coursebank:begin data
 #let cb-data = (
   course: (code: "COURSE 101", title: "Sample Course", term: "2026s"),

src/export/typst/templates/exam.typ

@@ -24,6 +24,8 @@
 // copy — export the `key` variant instead, or the day you forget an `if` is the
 // day the class gets the answers.
 
+#import "@preview/mitex:0.2.7": mi
+
 // ─────────────────────────────────────────────────────────────────────────────
 // Metadata
 // ─────────────────────────────────────────────────────────────────────────────
@@ -52,12 +54,14 @@
 // how a course changes the look without editing this file at all.
 #let extra = cb-meta.at("extra", default: (:))
 #let accent = rgb(extra.at("accent", default: "#1f4e79"))
-#let body-font = extra.at("font", default: "Libertinus Serif")
+#let body-font = extra.at("font", default: "Roboto")
 #let body-size = eval(extra.at("font-size", default: "11pt"))
 #let paper = extra.at("paper", default: "us-letter")
 #let show-name-block = extra.at("name-block", default: true)
 #let show-points = extra.at("show-points", default: true)
 #let page-per-item = extra.at("page-per-item", default: false)
+#let show-bubbles = extra.at("show-bubbles", default: true)
+#let bubble-radius = eval(extra.at("bubble-radius", default: "0.42em"))
 
 #let form-note = if cb-meta.form.at("count", default: 1) > 1 {
   " · Form " + cb-meta.form.id
@@ -120,6 +124,11 @@
   }
 }
 
+// An unfilled bubble a student marks by hand. `bubble-radius` is the same knob
+// the standalone answer sheet reads, so the two stay visually consistent if you
+// ever generate both.
+#let bubble() = circle(radius: bubble-radius, stroke: 0.5pt)
+
 // ─────────────────────────────────────────────────────────────────────────────
 // The renderer
 // ─────────────────────────────────────────────────────────────────────────────
@@ -154,11 +163,19 @@
 
   block(inset: (left: 1.2em))[
     #for opt in q.at("options", default: ()) {
-      grid(
-        columns: (1.4em, 1fr),
-        gutter: 0.2em,
-        [#(opt.letter + ".")], [#markup(opt.text)],
-      )
+      if show-bubbles {
+        grid(
+          columns: (1.6em, 1.4em, 1fr),
+          gutter: 0.2em,
+          align(horizon)[#bubble()], [#(opt.letter + ".")], [#markup(opt.text)],
+        )
+      } else {
+        grid(
+          columns: (1.4em, 1fr),
+          gutter: 0.2em,
+          [#(opt.letter + ".")], [#markup(opt.text)],
+        )
+      }
       v(0.15em)
     }
   ]

src/export/typst/templates/key.typ

@@ -13,6 +13,8 @@
 // paper's config, and it is why these are two templates rather than one with a
 // flag.
 
+#import "@preview/mitex:0.2.7": mi
+
 // coursebank:begin data
 #let cb-data = (
   course: (code: "COURSE 101", title: "Sample Course", term: "2026s"),