* 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 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01HWLPLy7ug7URSK5WybjRNa
* docs: list the social preview image in ATTRIBUTION.md
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01HWLPLy7ug7URSK5WybjRNa
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Co-authored-by: Claude Opus 5.5 <noreply@anthropic.com>
