Refactor code structure for improved readability and maintainability

frontend/components/admin/UserAuthTable.tsx

@@ -91,10 +91,10 @@ export function UserAuthTable({ users, isLoading, paginationInfo, onEditAuth, on
       label: "사용자명",
     },
     {
-      key: "company_name",
+      key: "company_code",
       label: "회사",
       hideOnMobile: true,
-      render: (_value, row) => <span>{row.company_name || row.company_code}</span>,
+      render: (value) => <span>{value || "-"}</span>,
     },
     {
       key: "dept_name",
@@ -122,7 +122,7 @@ export function UserAuthTable({ users, isLoading, paginationInfo, onEditAuth, on
   const cardFields: RDVCardField<any>[] = [
     {
       label: "회사",
-      render: (user) => <span>{user.company_name || user.company_code}</span>,
+      render: (user) => <span>{user.company_code || "-"}</span>,
     },
     {
       label: "부서",