fix: use cameleer logo as favicon, upgrade design system to v0.1.20, fix DataTable scroll

- Replace placeholder clock favicon with cameleer camel logo SVG
- Upgrade @cameleer/design-system from v0.1.19 to v0.1.20
- Add minHeight: 0 to main element to complete flex chain for fillHeight DataTable

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

ui/package.json

@@ -14,7 +14,7 @@
     "generate-api:live": "curl -s http://localhost:8081/api/v1/api-docs -o src/api/openapi.json && openapi-typescript src/api/openapi.json -o src/api/schema.d.ts"
   },
   "dependencies": {
-    "@cameleer/design-system": "^0.1.19",
+    "@cameleer/design-system": "^0.1.20",
     "@tanstack/react-query": "^5.90.21",
     "lucide-react": "^1.7.0",
     "openapi-fetch": "^0.17.0",