Adjust the resource editor layout

The resource editor uses tag#catinclude for _admin_edit_main_parts.tpl and _admin_edit_sidebar_parts.tpl. A category-specific override can therefore change one resource type without changing every editor screen.

1. Find the category's unique name and inspect the installed admin templates.
2. Add a matching override under the site's priv/templates, for example _admin_edit_main_parts.article.tpl.
3. Start from the current main-parts template and make the smallest change. Prefer the _admin_edit_content_extra.tpl extension point when you only need an extra widget.
4. Preserve the parent resource form, hidden resource ID, save wiring, translation controls and permission checks.
5. Test saving, validation errors, language switching and read-only access for that category and another category.

Do not copy an old complete admin_edit.tpl merely to move one widget. Such copies easily miss new publishing, access or form behaviour after an upgrade.