* docs: add OpenGraph and Twitter card tags to the book and web app Links to the docs site and the browser app now unfurl with a preview card. The book gets the tags through theme/head.hbs (og:title follows the page title); the web app's index.html carries its own, pointing at /app/. Both use the social preview image, now served from the book at /solidcraft/og.png. Co-Authored-By: Claude Opus 5.5 <[email protected]> Claude-Session: https://claude.ai/code/session_01HWLPLy7ug7URSK5WybjRNa * docs: list the social preview image in ATTRIBUTION.md Co-Authored-By: Claude Opus 5.5 <[email protected]> Claude-Session: https://claude.ai/code/session_01HWLPLy7ug7URSK5WybjRNa --------- Co-authored-by: Claude Opus 5.5 <[email protected]>