[robelsust]

Trac ticket: https://core.trac.wordpress.org/ticket/66360
See also: https://core.trac.wordpress.org/ticket/22660

Description

This PR resolves two related mobile/responsive administration issues:

1. Trac Ticket #66360: When the responsive admin menu (<= 782px) is expanded, #adminmenuwrap (width 190px) overlapped both the main content and #wpfooter text ("Thank you for creating with WordPress.").
   • #wpbody is statically positioned, rendering .wp-responsive-open #wpbody { right: -16em; } ineffective.
   • #wpfooter sits outside #wpcontent and was omitted from the shift rule, and was additionally pinned by left: 0.
   • #wpwrap.wp-responsive-open { overflow-x: hidden; } was scoped to max-width: 600px, causing horizontal scrollbar spillover on screens between 601px and 782px.
2. Trac Ticket #22660: When tapping admin bar dropdowns (such as "My Sites") while the responsive menu was open, the outside-click handler re-triggered the toggle button's click event, executing $adminbar.find( '.hover' ).removeClass( 'hover' ) and immediately closing the toolbar submenu.

Changes

• In src/wp-admin/css/common.css:
  • Updated the responsive offset rule to target #wpcontent (which wraps #wpbody) and #wpfooter:

    .wp-responsive-open #wpcontent,
    .wp-responsive-open #wpfooter {
        right: -16em;
        left: auto;
    }

  • Moved #wpwrap.wp-responsive-open { overflow-x: hidden; } into @media screen and (max-width: 782px).
• In src/js/_enqueues/admin/common.js:
  • Close the responsive menu directly on outside click and Escape/Tab ($wpwrap.removeClass( 'wp-responsive-open' )) without invoking the toggle button click handler so admin bar submenus remain open.
  • Broadened container boundary detection to check element identity and include #adminmenumain (covering both menu and backdrop).

Testing

• Verified in browser across 768px, 600px, and 375px viewports in both LTR and RTL modes.
• Verified that both #wpcontent and #wpfooter are fully cleared by the open sidebar without overlapping.
• Verified that tapping "My Sites" closes the mobile sidebar while successfully expanding the "My Sites" dropdown.
• Verified zero horizontal page scrolling.
• Ran npx eslint src/js/_enqueues/admin/common.js (0 errors).
• Ran npm run grunt precommit:css.

Props therssoftware.
Fixes #66360.
See #22660.

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