chore: add mermaid

Author: adithyaakrishna

apps/sim/package.json

@@ -126,6 +126,7 @@
     "lucide-react": "^0.479.0",
     "mammoth": "^1.9.0",
     "marked": "17.0.4",
+    "mermaid": "11.13.0",
     "mongodb": "6.19.0",
     "mysql2": "3.14.3",
     "nanoid": "^3.3.7",