Fix mobile layout issues in admin sidebar and top-header

src/components/admin/admin-mobile-wrapper.tsx

@@ -25,7 +25,9 @@ export function AdminMobileWrapper({
 		<div className="min-h-screen bg-[var(--admin-canvas)] flex flex-col lg:flex-row">
 			{/* Mobile header */}
 			<div
-				className="lg:hidden sticky top-0 z-50 flex items-center gap-3 px-4 py-3 border-b"
+				className={`lg:hidden sticky top-0 flex items-center gap-3 px-4 py-3 border-b ${
+					open ? "z-30" : "z-50"
+				}`}
 				style={{
 					backgroundColor: "var(--admin-sidebar-background)",
 					borderColor: "var(--admin-border)",