Mobile sidebar backdrop is never cleaned up on viewport resize — whole desktop layout stays blurred

[pfpro]

Describe the bug

#createNavigationToggler() (in assets/js/app.js) opens the mobile sidebar by adding ea-mobile-sidebar-visible to and appending a

. Both are only removed when the backdrop is clicked or the toggler is pressed again — never when the viewport changes.

When the browser window is resized from a mobile width (<992px, sidebar open) to ≥992px:

• the .modal-backdrop stays in the DOM. Since v5.2 it has backdrop-filter: blur(4px) (easyadmin-theme/modals.css), and at ≥992px the sidebar becomes position: static (base.css), so the leftover fixed backdrop (z-index 1050) paints above the entire layout — everything, including the sidebar and content, is blurred until the user happens to click somewhere.
• body.ea-mobile-sidebar-visible also stays, so the body.ea-mobile-sidebar-visible .sidebar rule keeps applying its mobile drop shadow to the static desktop sidebar.

Before 5.2 the leftover backdrop was a subtle dark overlay, so this mostly went unnoticed; the new blur makes it very visible.

To Reproduce

1. Open any EasyAdmin backend at a viewport <992px.
2. Open the sidebar via the hamburger (#navigation-toggler).
3. Resize the window to ≥992px (e.g. rotate a tablet, un-snap a window, drag wider).
4. The whole layout is blurred; inspecting shows the stale .modal-backdrop and the ea-mobile-sidebar-visible class.

Expected behavior

Growing past the desktop breakpoint closes the mobile sidebar state: backdrop removed, body class removed.

Possible fix

Watch the breakpoint inside #createNavigationToggler() and reuse the existing cleanup, e.g.:

window.matchMedia('(min-width: 992px)').addEventListener('change', (e) => {
    if (e.matches && document.body.classList.contains(cssClassName)) {
        document.body.classList.remove(cssClassName);
        if (modalBackdrop) {
            document.body.removeChild(modalBackdrop);
            modalBackdrop = null;
        }
    }
});

(EasyAdmin 5.2.0, Symfony 8.1, Bootstrap 5.3.8)