feat: Update to @xtr-dev/rondevu-client@0.6.0

Includes proper trickle ICE support:
- Offers/answers sent immediately (no waiting for ICE)
- Answering state now takes ~50-200ms instead of 15+ seconds
- ICE candidates trickle in as they're discovered
- Faster connection establishment

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude <noreply@anthropic.com>

package.json

@@ -10,7 +10,7 @@
     "deploy": "npm run build && npx wrangler pages deploy dist --project-name=rondevu-demo"
   },
   "dependencies": {
-    "@xtr-dev/rondevu-client": "^0.5.1",
+    "@xtr-dev/rondevu-client": "^0.6.0",
     "@zxing/library": "^0.21.3",
     "qrcode": "^1.5.4",
     "react": "^18.2.0",