Refactor HomePage to use custom Button component; enhance login service to fetch user with full relations for improved data handling.

client/src/pages/HomePage.tsx

@@ -1,3 +1,4 @@
+import Button from "../components/ui/Button";
 import { useMe, useLogout } from "../hooks/useAuth";
 import { useNavigate } from "react-router";
 
@@ -70,13 +71,13 @@ function HomePage() {
               </div>
             )}
 
-            <button
+            <Button
               onClick={handleLogout}
               disabled={logoutMutation.isPending}
               className="px-4 py-2 text-white bg-red-600 rounded-md hover:bg-red-700 disabled:opacity-50"
             >
               {logoutMutation.isPending ? "Выход..." : "Выйти"}
-            </button>
+            </Button>
           </div>
         </div>
       </div>