Fix: Settings panel not reflecting 'Sort by date' on Created Templates view

[Mustafabharmal]

What?

When navigating to Site Editor → Templates → Created (the user tab), templates are correctly sorted by date, but the Settings panel displays "Sort by: Template" instead of "Sort by: Date". The sort dropdown also doesn't offer a Date option.

Closes #75136.

Why?

wp_template is a design post type. The usePostFields hook in @wordpress/editor explicitly excludes dateField for all design post types:

! DESIGN_POST_TYPES.includes( postTypeConfig.slug ) && dateField,

Both rendering paths for the template list (legacy router in edit-site and new router in template-list) called usePostFields({ postType: 'wp_template' }) to obtain dateField. This always returned undefined for templates, so dateField was never added to the DataViews fields array. With no registered date field, DataViews' SortFieldControl couldn't reflect view.sort.field === 'date' and fell back to the first available field ("Template").

How?

Import dateField directly from @wordpress/fields in both paths, bypassing usePostFields. Push it to the fields array when activeView === 'user' (the Created Templates tab), matching the existing getActiveViewOverridesForTab('user') sort override.

Testing instructions

1. Ensure that “Template Activation” experiment is enabled.
2. Open Site Editor → Templates.
3. Click the Created tab (user-created templates).
4. Open the Settings panel (top-right grid/list view options).
5. Confirm Sort by: Date is selected and the Date option is available in the dropdown.
6. Switch to the All or Theme tab and confirm Sort by: Template is shown (unchanged behaviour).

Screenshots or screencast

Before	After

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Co-authored-by: Mustafabharmal <mustafabharmal@git.wordpress.org>
Co-authored-by: gigitux <gigitux@git.wordpress.org>

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