List code blocks on WordPress, and category names for non-owners

Fixed

• Workspace members now see real category and author names in the WordPress panel
  Non-owner members previously saw categories as bare numbers and “No authors available” when editing WordPress posts. Category, tag, author, and content-type lists now load correctly for every member of the workspace.
• Code blocks inside a list item now keep their formatting on WordPress
  A list step containing a code block, quote, table or heading was being flattened into plain text on the WordPress site. Such content is now placed right after the list item, with the list’s numbering continued after it.