Show Backoffice menu only for Superadmin users

frontend/src/components/sidebar.tsx

@@ -89,10 +89,14 @@ const candidateItems = [
 export function Sidebar() {
     const pathname = usePathname()
     const user = getCurrentUser()
+    const isSuperadmin = user?.role === "superadmin"
 
     let items = candidateItems
     if (isAdminUser(user)) {
-        items = adminItems
+        // For Admin (not Superadmin), filter out Backoffice
+        items = isSuperadmin
+            ? adminItems
+            : adminItems.filter(item => item.href !== "/dashboard/backoffice")
     } else if (user?.role === "company") {
         items = companyItems
     }