refactor: unify all brand icons to single SVG from DS v0.1.36

Replace PNG favicons and brand logos with cameleer3-logo.svg from
@cameleer/design-system/assets. Favicon, login dialog, and sidebar
all use the same SVG. Remove PNG favicon files from public/.

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": "^0.1.34",
+    "@cameleer/design-system": "^0.1.36",
     "@tanstack/react-query": "^5.90.21",
     "lucide-react": "^1.7.0",
     "openapi-fetch": "^0.17.0",