fix(typst): ship template as partials so code blocks render (#12)

The single-file `template: civilytics-typst.typ` discarded Quarto's
auto-generated `definitions` partial, so any Typst document containing a
code block failed with `unknown variable: Skylighting`.

Ship the template as Quarto template-partials instead, so Quarto keeps its
definitions (Skylighting + token functions) and syntax-highlighted code
blocks render while the Civilytics branding still applies:

- split civilytics-typst.typ into typst-template.typ (the styling function)
  and typst-show.typ (the show/entry point, keyword-safe [ ] wrapping kept);
  remove the single-file template
- use_civilytics_theme() now copies both partials and prints the
  template-partials usage
- example report.qmd uses template-partials

Verified: a report with an R code block renders with working syntax
highlighting and full branding.

R/quarto.R

@@ -135,12 +135,12 @@ use_civilytics_theme <- function(path = ".", force = FALSE) {
     .copy_pkg_file(file.path("quarto/latex", f), file.path("latex", f), path, force)
   }
 
-  # Typst
-  .copy_pkg_file(
-    "quarto/typst/civilytics-typst.typ",
-    "typst/civilytics-typst.typ",
-    path, force
-  )
+  # Typst — shipped as template-partials so Quarto keeps its Skylighting
+  # definitions and syntax-highlighted code blocks render (see issue #12)
+  typst_files <- c("typst-template.typ", "typst-show.typ")
+  for (f in typst_files) {
+    .copy_pkg_file(file.path("quarto/typst", f), file.path("typst", f), path, force)
+  }
 
   # Logos — for _brand.yml (expects assets/logo/)
   .copy_logos("assets/logo", path, force)
@@ -158,7 +158,9 @@ use_civilytics_theme <- function(path = ".", force = FALSE) {
   message("    include-in-header: latex/civilytics.tex")
   message("    include-before-body: latex/civilytics-title.tex")
   message("  typst:")
-  message("    template: typst/civilytics-typst.typ")
+  message("    template-partials:")
+  message("      - typst/typst-template.typ")
+  message("      - typst/typst-show.typ")
   message("---")
   message("\nSee examples/report.qmd for a complete example.")
   invisible(NULL)

inst/quarto/examples/report.qmd

@@ -19,7 +19,9 @@ format:
     toc: true
     toc-location: right
   typst:
-    template: ../typst/civilytics-typst.typ
+    template-partials:
+      - ../typst/typst-template.typ
+      - ../typst/typst-show.typ
   pdf:
     include-in-header: ../latex/civilytics.tex
     include-before-body: ../latex/civilytics-title.tex

inst/quarto/typst/typst-show.typ

@@ -0,0 +1,17 @@
+// Civilytics — Typst show/entry partial for Quarto (typst-show.typ).
+// Pairs with typst-template.typ. Quarto appends the rendered document body
+// after this partial, so this file intentionally ends with the show rule and
+// no trailing body token. (Do not write that token in a comment here: Quarto
+// interpolates its template variables even inside comments.)
+// Title/subtitle/date are wrapped in [ ] so arbitrary text (including words
+// that are Typst keywords like "for"/"in") is treated as content, not code.
+// See civilyticsR issue #12.
+#show: doc => civilytics(
+  title: [$title$],
+  $if(subtitle)$subtitle: [$subtitle$],$endif$
+  $if(by-author)$authors: ($for(by-author)$"$it.name.literal$",$endfor$),$endif$
+  $if(date)$date: [$date$],$endif$
+  $if(abstract)$abstract: [$abstract$],$endif$
+  toc: $if(toc)$true$else$false$endif$,
+  doc
+)

inst/quarto/typst/typst-template.typ

@@ -1,9 +1,15 @@
 // =============================================================
-// Civilytics — Typst template for Quarto PDF
+// Civilytics — Typst template partial for Quarto PDF (typst-template.typ).
+// Shipped as a Quarto template-partial (paired with typst-show.typ) rather
+// than a full `template:` so Quarto keeps its own `definitions` partial —
+// which defines Skylighting/token functions needed for syntax-highlighted
+// code blocks. See civilyticsR issue #12.
 // Usage in YAML:
 //   format:
 //     typst:
-//       template: quarto/typst/civilytics-typst.typ
+//       template-partials:
+//         - quarto/typst/typst-template.typ
+//         - quarto/typst/typst-show.typ
 // =============================================================
 
 #let paper-bg   = rgb("#FAF7F2")
@@ -229,19 +235,3 @@
 
   doc
 }
-
-// Quarto entry point
-// Title/subtitle/date are wrapped in [ ] so arbitrary text (incl. words that
-// are Typst keywords like "for"/"in") is treated as content, not code.
-// See civilyticsR issue #12.
-#show: doc => civilytics(
-  title: [$title$],
-  $if(subtitle)$subtitle: [$subtitle$],$endif$
-  $if(by-author)$authors: ($for(by-author)$"$it.name.literal$",$endfor$),$endif$
-  $if(date)$date: [$date$],$endif$
-  $if(abstract)$abstract: [$abstract$],$endif$
-  toc: $if(toc)$true$else$false$endif$,
-  doc
-)
-
-$body$