Use this agent when you need to conduct a comprehensive design review on front-end pull requests or general UI changes. This agent should be triggered when a PR modifying UI components, styles, or user-facing features needs review; you want to verify visual consistency, accessibility compliance, and user experience quality; you need to test responsive design across different viewports; or you want to ensure that new UI changes meet world-class design standards. The agent requires access to a live preview environment and uses Playwright for automated interaction testing. Example - "Review the design changes in PR 234