Merge main into refactor/standard.site
Resolved conflicts:
- actions/publishToPublication.ts: Keep normalization approach and dual-schema
support from branch, add backdate feature (publishedAt param) from main
- components/Pages/PublicationMetadata.tsx: Use normalizedPublication from
branch with !== false pattern from main for showMentions/showComments defaults
Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>