test: 통합 테스트 오류 및 경고 수정

- 모든 서비스 메서드 시그니처를 실제 구현에 맞게 수정
- TestDataGenerator 제거하고 직접 객체 생성으로 변경
- 모델 필드명 및 타입 불일치 수정
- 불필요한 Either 패턴 사용 제거
- null safety 관련 이슈 해결

수정된 파일:
- test/integration/screens/company_integration_test.dart
- test/integration/screens/equipment_integration_test.dart
- test/integration/screens/user_integration_test.dart
- test/integration/screens/login_integration_test.dart

lib/screens/user/user_list_redesign.dart

@@ -529,38 +529,59 @@ class _UserListRedesignState extends State<UserListRedesign> {
                                   child: Row(
                                     mainAxisSize: MainAxisSize.min,
                                     children: [
-                                      IconButton(
-                                        icon: Icon(
-                                          Icons.power_settings_new,
-                                          size: 16,
-                                          color: user.isActive ? Colors.orange : Colors.green,
+                                      Flexible(
+                                        child: IconButton(
+                                          constraints: const BoxConstraints(
+                                            minWidth: 30,
+                                            minHeight: 30,
+                                          ),
+                                          padding: const EdgeInsets.all(4),
+                                          icon: Icon(
+                                            Icons.power_settings_new,
+                                            size: 16,
+                                            color: user.isActive ? Colors.orange : Colors.green,
+                                          ),
+                                          onPressed: user.id != null
+                                              ? () => _showStatusChangeDialog(user)
+                                              : null,
+                                          tooltip: user.isActive ? '비활성화' : '활성화',
                                         ),
-                                        onPressed: user.id != null
-                                            ? () => _showStatusChangeDialog(user)
-                                            : null,
-                                        tooltip: user.isActive ? '비활성화' : '활성화',
                                       ),
-                                      IconButton(
-                                        icon: Icon(
-                                          Icons.edit,
-                                          size: 16,
-                                          color: ShadcnTheme.primary,
+                                      Flexible(
+                                        child: IconButton(
+                                          constraints: const BoxConstraints(
+                                            minWidth: 30,
+                                            minHeight: 30,
+                                          ),
+                                          padding: const EdgeInsets.all(4),
+                                          icon: Icon(
+                                            Icons.edit,
+                                            size: 16,
+                                            color: ShadcnTheme.primary,
+                                          ),
+                                          onPressed: user.id != null
+                                              ? () => _navigateToEdit(user.id!)
+                                              : null,
+                                          tooltip: '수정',
                                         ),
-                                        onPressed: user.id != null
-                                            ? () => _navigateToEdit(user.id!)
-                                            : null,
-                                        tooltip: '수정',
                                       ),
-                                      IconButton(
-                                        icon: Icon(
-                                          Icons.delete,
-                                          size: 16,
-                                          color: ShadcnTheme.destructive,
+                                      Flexible(
+                                        child: IconButton(
+                                          constraints: const BoxConstraints(
+                                            minWidth: 30,
+                                            minHeight: 30,
+                                          ),
+                                          padding: const EdgeInsets.all(4),
+                                          icon: Icon(
+                                            Icons.delete,
+                                            size: 16,
+                                            color: ShadcnTheme.destructive,
+                                          ),
+                                          onPressed: user.id != null
+                                              ? () => _showDeleteDialog(user.id!, user.name)
+                                              : null,
+                                          tooltip: '삭제',
                                         ),
-                                        onPressed: user.id != null
-                                            ? () => _showDeleteDialog(user.id!, user.name)
-                                            : null,
-                                        tooltip: '삭제',
                                       ),
                                     ],
                                   ),