fix: render lang of code block

composables/content.ts

@@ -60,10 +60,9 @@ export function contentToVNode(
       return `:${name}:`
     })
     // handle code frames
-    .replace(/<p>(```|~~~)([\s\S]+?)\1/g, (_1, _2, raw) => {
-      const plain = htmlToText(`<p>${raw}</p>`).trim()
-      const [lang, ...rest] = plain.split(/\n/)
-      return `<custom-code lang="${lang?.trim().toLowerCase() || ''}" code="${encodeURIComponent(rest.join('\n'))}"></custom-code>`
+    .replace(/<p>(```|~~~)([\w]*)([\s\S]+?)\1/g, (_1, _2, lang, raw) => {
+      const code = htmlToText(`<p>${raw}</p>`)
+      return `<custom-code lang="${lang?.trim().toLowerCase() || ''}" code="${encodeURIComponent(code)}"></custom-code>`
     })
 
   const tree = parseFragment(content)