[krflol]

Add a 50-second invoice walkthrough for people trying Fullbleed for the first time. The guide shows the real playground changing a recipient and heading color, downloading the PDF, and exporting a Node.js project. It includes a complete transcript, English captions, and the commands for continuing locally.

The optional link stays inline with the introduction to keep the first PDF visible on narrow screens, and opens in a new tab to preserve playground edits. Native example selectors use the light palette of their panels in dark mode. The video is hosted with the Docs site and downloads only when played. The engine and package pins remain unchanged.

Validation:

• Strict MkDocs build passed with the existing prebuilt engine assets.
• Desktop and mobile Chrome checks passed for page metadata, layout, playback, captions, deferred media loading, and preserving edited playground source.
• Chrome, Firefox, and WebKit passed the existing 28-check mobile journey, including the initial preview at 320×740, editing, keyboard focus, imports, PDF/project downloads, and recovery. One initial local Chrome desktop load returned a fetch error; an instrumented serial run passed, and both records are retained. The existing CI gates remain required.
• Direct visual review passed after correcting the description metadata.
• The real public Node.js 0.9.5 export was installed anonymously with scripts disabled; npm run render reproduced the recorded PDF and preview bytes.
• The 1080p MP4 passed full decoding, browser playback, and seeking checks. CI retains the generated-page verification screenshots.

This is a first-use tutorial, not an adoption or accessibility-conformance claim.