The mobile sidebar cannot be closed with the Escape key

Description

The open mobile sidebar (hamburger menu) cannot be dismissed with the Escape key. The bundle's et() handler only toggles on the hamburger click and closes via the modal-backdrop click — there is no Escape handler (unlike the user dropdown, which the admin JS closes on Escape).

Expected

• Escape should close the open mobile sidebar (remove ea-mobile-sidebar-visible and any backdrop), matching standard modal/drawer behaviour.

Workaround we use today (not viable upstream)

We had to add it in our own admin-custom.js:

document.addEventListener('keydown', function(e) {
    if (e.key === 'Escape' && document.body.classList.contains('ea-mobile-sidebar-visible')) {
        document.body.classList.remove('ea-mobile-sidebar-visible');
    }
});

This belongs in the bundle's et() alongside the toggler/backdrop close logic.

Environment

EasyAdmin v5.5.1 (@media (max-width:991px) responsive header / mobile sidebar).

Locate the bundle's et() handler that currently responds to the hamburger and modal-backdrop clicks, and compare it with the admin JavaScript Escape handling for the user dropdown. Add coverage for dismissing the mobile sidebar with Escape, ensuring ea-mobile-sidebar-visible and its backdrop are cleared.