Activity

Summary

• Adds sticky table of contents in the right sidebar for articles with 3+ headings, with scroll-tracking active state via IntersectionObserver
• Adds collapsible mobile TOC for small screens
• Adds cross-linking footer with related articles and services sections for internal SEO linking
• Integrates rehype-slug for automatic heading ID generation and anchor links
• Fixes 500 error from incorrect location_id query on services table

Test plan

• Visit an article with multiple headings (e.g. Claude Code troubleshooting guide) and verify TOC appears in right sidebar
• Click TOC items and verify smooth scroll to correct heading
• Scroll through article and verify active TOC item highlights
• Resize to mobile and verify inline collapsible TOC appears
• Verify related articles and services show in footer
• Verify article type badge displays for non-blog types (e.g. "Guide")