Gives you eyes on a locally running web app. Opens the URL in a headless Chromium browser and returns (1) a screenshot of the rendered page, (2) any console errors/warnings and failed network requests, and (3) a token-optimized DOM snapshot that preserves ids and CSS/Tailwind classes. Use it to verify or debug UI work instead of guessing: layout and alignment bugs, overflow, spacing, responsive breakpoints, hydration errors and missing assets. Read the classes in the DOM snapshot before proposing a fix so you edit real selectors. Only local addresses (localhost / private network) are permitted.