feat(utils): vendor mermaid rendering

package.json

@@ -5,7 +5,6 @@
   "type": "module",
   "packageManager": "bun@1.3.14",
   "patchedDependencies": {
-    "beautiful-mermaid@1.1.3": "patches/beautiful-mermaid@1.1.3.patch",
     "@ark/schema@0.56.0": "patches/@ark%2Fschema@0.56.0.patch"
   },
   "workspaces": {
@@ -55,7 +54,6 @@
       "@typescript/native-preview": "7.0.0-dev.20260609.1",
       "@xterm/headless": "^6.0.0",
       "arktype": "^2.2.0",
-      "beautiful-mermaid": "^1.1.3",
       "chalk": "^5.6.2",
       "chart.js": "^4.5.1",
       "date-fns": "^4.4.0",