The AP blueprint was consolidated but 4 references to the old
'actors.profile' endpoint remained, causing BuildError on social pages.
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
Replace standalone base.html with the shared _types/root layout.
Social pages get a second nav row via _types/social/index.html.
Root / becomes a blank page with shared chrome. Auth pages use
the shared layout without the social nav bar.
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>