fix(deps): update dependency streamdown to v2

Author: renovate[bot]

package.json

@@ -72,7 +72,7 @@
     "remark-math": "^6.0.0",
     "shiki": "^3.20.0",
     "sonner": "^2.0.7",
-    "streamdown": "^1.6.10",
+    "streamdown": "^2.0.0",
     "tailwind-merge": "3.4.0"
   },
   "devDependencies": {