MYCDIC Search Authority visual hotfix v1.9.30.1

Main fixes:
1. Reading Guide navigation no longer inherits the site's global red <nav> background.
2. In-article TOC navigation is isolated from the public header navigation CSS.
3. Green authority callout regains its intended internal padding and spacing.
4. Sticky reading rail is cleaner, scroll-safe, and responsive.
5. Section anchors, list semantics, question cards, and mobile spacing were polished.

For new SEO / GEO authority pages:
- Load /search-authority-v19301.css?v=1.9.30.1 after the main site styles.
- Load /search-authority-v19301.js?v=1.9.30.1 with defer.
- Keep <body class="sa-page">.
- The shared JS automatically builds the Reading Guide from .sa-section headings.
