feat: improve playground preview annotations

Author: Simon-He95

playground/package.json

@@ -15,6 +15,7 @@
     "@tailwindcss/typography": "^0.5.19",
     "@terrastruct/d2": ">=0.1.33",
     "@vueuse/core": "^13.9.0",
+    "drauu": "^1.0.0",
     "katex": "^0.16.43",
     "markstream-vue": "workspace:*",
     "stream-markdown": "latest",