feat(agent): implement streamdown for real-time message rendering in chat

web/package.json

@@ -35,6 +35,7 @@
         "react-router": "^7.12.0",
         "react-router-dom": "^7.12.0",
         "shadcn": "^4.7.0",
+        "streamdown": "^2.5.0",
         "tailwind-merge": "^3.6.0",
         "tailwindcss": "^4",
         "tw-animate-css": "^1.4.0",
@@ -42,11 +43,11 @@
     },
     "devDependencies": {
         "@tailwindcss/postcss": "^4",
-        "@vitejs/plugin-react": "^5.2.0",
         "@types/file-saver": "^2.0.7",
         "@types/node": "^20",
         "@types/react": "19.1.12",
         "@types/react-dom": "19.1.9",
+        "@vitejs/plugin-react": "^5.2.0",
         "prettier": "^3.8.3",
         "typescript": "^5",
         "vite": "^7.3.0"