feat: support markdown formatting and rendering

Resolves #110
Goes the extra mile and supports markdown for sending code and formatted
text, almost document-like. It feels more like GitHub's comments and
text areas.

js/package.json

@@ -56,14 +56,18 @@
     "clsx": "^2.1.1",
     "electron-squirrel-startup": "^1.0.1",
     "firebase": "^12.10.0",
+    "highlight.js": "^11.11.1",
     "livekit-client": "^2.18.0",
     "lucide-react": "^0.575.0",
     "next-themes": "^0.4.6",
     "radix-ui": "^1.4.3",
     "react": "^19.2.4",
     "react-dom": "^19.2.4",
+    "react-markdown": "^10.1.0",
     "react-router-dom": "^7.13.0",
     "react-use": "^17.6.0",
+    "rehype-highlight": "^7.0.2",
+    "remark-gfm": "^4.0.1",
     "shadcn": "^3.8.5",
     "sonner": "^2.0.7",
     "tailwind-merge": "^3.5.0",