fix(adminfront): prevent bulk import modal from unmounting when dropdown closes

Lifted the modal state out of the DropdownMenuContent to ensure the dialog does not unmount immediately when the dropdown item is clicked.

adminfront/src/features/users/UserListPage.tsx

@@ -146,6 +146,7 @@ function UserListPage() {
     React.useState("");
   const [sortConfig, setSortConfig] =
     React.useState<SortConfig<UserSortKey> | null>(null);
+  const [bulkUploadOpen, setBulkUploadOpen] = React.useState(false);
 
   const limit = 1000;
   const offset = (page - 1) * limit;
@@ -513,10 +514,16 @@ function UserListPage() {
                   {t("ui.admin.users.csv_template", "템플릿 다운로드")}
                 </DropdownMenuItem>
                 <DropdownMenuSeparator />
-                <UserBulkUploadModal
-                  variant="dropdown"
-                  onSuccess={() => query.refetch()}
-                />
+                <DropdownMenuItem
+                  onSelect={(e) => {
+                    e.preventDefault();
+                    setBulkUploadOpen(true);
+                  }}
+                  className="cursor-pointer"
+                >
+                  <Upload size={16} className="mr-2 opacity-50" />
+                  {t("ui.admin.users.list.bulk_import", "일괄 등록 (CSV)")}
+                </DropdownMenuItem>
                 <DropdownMenuSeparator />
                 <DropdownMenuItem
                   onClick={() => handleExport(false)}
@@ -538,6 +545,12 @@ function UserListPage() {
                 </DropdownMenuItem>
               </DropdownMenuContent>
             </DropdownMenu>
+            <UserBulkUploadModal
+              variant="custom"
+              open={bulkUploadOpen}
+              onOpenChange={setBulkUploadOpen}
+              onSuccess={() => query.refetch()}
+            />
             <Dialog>
               <DialogTrigger asChild>
                 <Button variant="outline" size="icon" className="h-9 w-9">