Administration: Replace pure white body background on Font Library and Connectors pages.

The `wp-admin` integrated wrappers for the Font Library (`font-library.php`) and
the new Connectors page (`options-connectors.php`) set an inline `body { background: #fff; }`,
which is against established accessibility and UX best practices ("Never use full white"),
causes white-on-white content cards to blend into the page background, and is inconsistent
with every other core admin screen.

This replaces the pure white override with `#f0f0f1`, the standard `wp-admin` body
background color defined in `wp-admin/css/common.css`. The change restores visual
separation between the white `.components-item` cards and their surrounding chrome
and aligns these pages with the rest of the core admin UI.

Remaining accessibility items from the ticket (inappropriate `<header>` landmark
and ARIA landmark nesting) live in the Gutenberg `@wordpress/admin-ui` Page component
and will be picked up on the next Gutenberg package sync.

Props joedolson, afercia, hbhalodia, wildworks.
See #65100.

Made-with: Cursor

Author: itzmekhokan

src/wp-includes/build/pages/font-library/page-wp-admin.php

@@ -226,7 +226,7 @@ function wp_font_library_wp_admin_render_page() {
 			overflow-y: auto;
 		}
 		body {
-			background: #fff;
+			background: #f0f0f1;
 		}
 
 		/* Reset wp-admin padding */

src/wp-includes/build/pages/options-connectors/page-wp-admin.php

@@ -226,7 +226,7 @@ function wp_options_connectors_wp_admin_render_page() {
 			overflow-y: auto;
 		}
 		body {
-			background: #fff;
+			background: #f0f0f1;
 		}
 
 		/* Reset wp-admin padding */