feat: enhance layout and sidebar functionality with new PageHeader and SidebarContext

src/pages/AdminUsersPage.tsx

@@ -51,14 +51,6 @@ export function AdminUsersPage() {
 
   return (
     <div className="space-y-6">
-      <div className="flex items-center justify-between">
-        <div>
-          <h1 className="text-3xl font-bold">User Management</h1>
-          <p className="text-muted-foreground">Manage users and their permissions</p>
-        </div>
-        <Button>Add User</Button>
-      </div>
-
       <Card>
         <CardHeader>
           <CardTitle>Users</CardTitle>