fix: update typst template to use 'box' instead of 'block' for styling (#44)

Author: allenge007

template/shared.typ

@@ -7,7 +7,7 @@
   set page(paper: "a4", numbering: "1", number-align: center)
   set text(font: fonts.serif, lang: "zh", size: 11pt)
 
-  show raw.where(block: true): block.with(fill: luma(240), inset: (x: 1.25em, y: 1em), width: 100%, radius: 4pt)
+  show raw.where(block: true): box.with(fill: luma(240), inset: (x: 1.25em, y: 1em), width: 100%, radius: 4pt)
 
   show raw.where(block: true): par.with(first-line-indent: 0em, justify: true, leading: 8pt)