Refactor transaction edit dialog

Modify TransactionEditDialog to only change the desktop page layout.

src/components/Header.tsx

@@ -4,6 +4,7 @@ import { Bell } from 'lucide-react';
 import { useAuth } from '@/contexts/auth';
 import { Avatar, AvatarFallback, AvatarImage } from '@/components/ui/avatar';
 import { Skeleton } from '@/components/ui/skeleton';
+import { useIsMobile } from '@/hooks/use-mobile';
 
 const Header: React.FC = () => {
   const {
@@ -12,6 +13,7 @@ const Header: React.FC = () => {
   const userName = user?.user_metadata?.username || '익명';
   const [imageLoaded, setImageLoaded] = useState(false);
   const [imageError, setImageError] = useState(false);
+  const isMobile = useIsMobile();
 
   // 이미지 프리로딩 처리
   useEffect(() => {