Enhance layout

src/shared/components/layouts/DashboardLayout.js

@@ -12,7 +12,7 @@ export default function DashboardLayout({ children }) {
       {/* Mobile sidebar overlay */}
       {sidebarOpen && (
         <div
-          className="fixed inset-0 z-40 bg-black/50 lg:hidden"
+          className="fixed inset-0 z-40 bg-black/20 lg:hidden"
           onClick={() => setSidebarOpen(false)}
         />
       )}