Issue #3541910: Hide the side panel from visibility

Shashank Rairequested to merge
issue/drupal-3541910:3541910-elements-in-closed into main

Closes #3541910

This update adds a visibility: hidden style to the toolbar navigation on mobile devices when the sidebar is not expanded.

The change ensures that the hidden sidebar navigation elements are not focusable or interactable via keyboard navigation, improving accessibility

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