chore(spec): regenerate authorable-defaults after merging origin/main

Claude-Session: https://claude.ai/code/session_0127kfChiciCXiqVX5g7E5rJ
Co-authored-by: Claude <noreply@anthropic.com>

Author: claude

packages/spec/authorable-defaults/ui.json

@@ -45,7 +45,6 @@
     "ui/FormField:span = \"auto\"",
     "ui/FormSection:collapsed = false",
     "ui/FormSection:collapsible = false",
-    "ui/FormSection:columns = 1",
     "ui/FormView:type = \"simple\"",
     "ui/GalleryConfig:cardSize = \"medium\"",
     "ui/GalleryConfig:coverFit = \"cover\"",