feat: improve replay workflow and viewer UI

Co-Authored-By: Claude Fable 5 <[email protected]>

frontend/package.json

@@ -15,7 +15,9 @@
     "hls.js": "^1.5.14",
     "react": "^18.3.1",
     "react-dom": "^18.3.1",
-    "react-router-dom": "^6.26.2"
+    "react-markdown": "^10.1.0",
+    "react-router-dom": "^6.26.2",
+    "remark-gfm": "^4.0.1"
   },
   "devDependencies": {
     "@types/react": "^18.3.8",