Fix mobile layout issues in admin sidebar and top-header

src/app/admin/layout.tsx

@@ -398,7 +398,7 @@ async function Sidebar({
 	return (
 		<aside
 			data-admin
-			className="sticky top-0 self-start h-auto lg:h-screen overflow-y-auto bg-[var(--admin-sidebar-background)] text-[var(--admin-sidebar-text-readable)] shadow-xl flex flex-col"
+			className="max-lg:static sticky top-0 self-start h-full lg:h-screen overflow-y-auto bg-[var(--admin-sidebar-background)] text-[var(--admin-sidebar-text-readable)] shadow-xl flex flex-col"
 		>
 			<div className="flex items-center gap-3 px-4 py-5 border-b border-[var(--admin-border)]">
 				<span