feat(canvas): 画布创作对话 - 统一流式 Markdown 展示与交互修复

web/package.json

@@ -22,6 +22,7 @@
         "@mediapipe/tasks-vision": "^1.0.1",
         "@react-three/drei": "^10.7.7",
         "@react-three/fiber": "^9.6.1",
+        "@streamdown/code": "^1.1.1",
         "@tanstack/react-query": "^5.101.2",
         "@tanstack/react-virtual": "^3.14.8",
         "@tiptap/extension-character-count": "^3.28.0",
@@ -54,6 +55,7 @@
         "react-router": "^8.2.0",
         "recharts": "^3.9.2",
         "shadcn": "^4.13.1",
+        "streamdown": "^2.5.0",
         "tailwind-merge": "^3.6.0",
         "tailwindcss": "^4.3.3",
         "three": "^0.185.1",