Fix infinite scroll and load more button by including pagination metadata in AJAX response

[Copilot]

The media library's infinite scroll and load more button were broken because the custom query-attachments AJAX handler returned only the posts array, missing pagination metadata that WordPress's media views require.

Changes

• Modified wp_media_categories_ajax_query_attachments() to return pagination metadata alongside posts:
  • total: Total posts found ($query->found_posts)
  • max_num_pages: Maximum page count ($query->max_num_pages)

This matches WordPress core's response structure:

// Before
wp_send_json_success( $posts );

// After
wp_send_json_success( array(
    'posts'         => $posts,
    'total'         => $query->found_posts,
    'max_num_pages' => $query->max_num_pages
) );

Without max_num_pages, the media library cannot determine if more items exist to load.

Original prompt

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This section details on the original issue you should resolve

<issue_title>Broken Loading</issue_title>
<issue_description>The infinite loading (and fall back load more button) are both not working when this plugin is active. I don't mind hitting the load more button if we can actually browse the media library. </issue_description>

Comments on the Issue (you are @copilot in this section)

• Fixes Broken Loading #8

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[Copilot]

Pull request overview

This PR fixes the broken infinite scroll and "load more" button in the media library by including essential pagination metadata in the AJAX response. The plugin's custom query-attachments handler was only returning the posts array, which prevented WordPress's media views from determining if more items existed to load.

• Modified the AJAX response structure to include total (found_posts) and max_num_pages fields alongside the posts array
• Aligns the response format with WordPress core's expectations for media library pagination

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