feat(history): Implement conversation history management with artifact restoration and Markdown rendering.

frontend/package.json

@@ -13,6 +13,7 @@
   "dependencies": {
     "@hookform/resolvers": "^5.2.2",
     "@tailwindcss/vite": "^4.1.18",
+    "@types/react-syntax-highlighter": "^15.5.13",
     "axios": "^1.13.5",
     "class-variance-authority": "^0.7.1",
     "clsx": "^2.1.1",
@@ -21,7 +22,10 @@
     "react": "^19.2.0",
     "react-dom": "^19.2.0",
     "react-hook-form": "^7.71.1",
+    "react-markdown": "^10.1.0",
     "react-router-dom": "^7.13.0",
+    "react-syntax-highlighter": "^16.1.0",
+    "remark-gfm": "^4.0.1",
     "tailwind-merge": "^3.4.0",
     "tailwindcss": "^4.1.18",
     "zod": "^4.3.6"