first commit

src/components/shared/navigation/SidebarOverlay.tsx

@@ -0,0 +1,19 @@
+export function SidebarOverlay({
+  open,
+  onClose,
+}: {
+  open: boolean;
+  onClose: () => void;
+}) {
+  return (
+    <button
+      aria-label="Chiudi navigazione"
+      className={`fixed inset-0 z-40 bg-slate-950/25 backdrop-blur-sm transition-opacity duration-200 ease-out lg:hidden ${
+        open ? "opacity-100" : "pointer-events-none opacity-0"
+      }`}
+      onClick={onClose}
+      tabIndex={open ? 0 : -1}
+      type="button"
+    />
+  );
+}