feat(dashboard): 결재 역할 뱃지와 문서 정합성 반영

- doc/frontend_backend_alignment_report.md에 roles 필터 적용 배경과 UI 반영 사항을 기록

- lib/features/dashboard/data/dashboard_summary_dto.dart에서 roles 파싱과 enum 매핑 로직, 문자열 리스트 util 추가

- lib/features/dashboard/domain/entities/dashboard_pending_approval.dart에 역할 enum과 도메인 필드 추가

- lib/features/dashboard/presentation/pages/dashboard_page.dart에서 결재 카드 헤더/설명 수정 및 역할 뱃지 렌더링 지원

- test/features/dashboard/data/dashboard_summary_dto_test.dart 신규 작성해 DTO→도메인 매핑과 무시 케이스를 검증

- test/features/masters/user/presentation/pages/user_page_test.dart에서 사용되지 않는 PermissionManager import 제거

test/features/dashboard/data/dashboard_summary_dto_test.dart

@@ -0,0 +1,59 @@
+import 'package:flutter_test/flutter_test.dart';
+import 'package:superport_v2/features/dashboard/data/dtos/dashboard_summary_dto.dart';
+import 'package:superport_v2/features/dashboard/domain/entities/dashboard_pending_approval.dart';
+
+void main() {
+  group('DashboardSummaryDto', () {
+    test('maps pending approval roles into domain entities', () {
+      final dto = DashboardSummaryDto.fromJson({
+        'generated_at': '2025-01-01T00:00:00Z',
+        'kpis': [],
+        'recent_transactions': [],
+        'pending_approvals': [
+          {
+            'approval_id': 1,
+            'approval_no': 'APP-001',
+            'title': '입고 결재',
+            'step_summary': '1단계 → 2단계',
+            'requested_at': '2025-01-01T03:00:00Z',
+            'roles': ['assigned', 'requested', 'completed'],
+          },
+        ],
+      });
+
+      final entity = dto.toEntity();
+      final approval = entity.pendingApprovals.single;
+
+      expect(
+        approval.roles,
+        containsAll(<DashboardApprovalRole>[
+          DashboardApprovalRole.assigned,
+          DashboardApprovalRole.requester,
+          DashboardApprovalRole.completed,
+        ]),
+      );
+    });
+
+    test('ignores unknown role tokens gracefully', () {
+      final dto = DashboardSummaryDto.fromJson({
+        'generated_at': '2025-01-01T00:00:00Z',
+        'kpis': [],
+        'recent_transactions': [],
+        'pending_approvals': [
+          {
+            'approval_id': 2,
+            'approval_no': 'APP-002',
+            'title': '출고 결재',
+            'step_summary': '3단계',
+            'requested_at': '2025-01-02T03:00:00Z',
+            'roles': ['REQUESTER', 'unknown', ''],
+          },
+        ],
+      });
+
+      final approval = dto.toEntity().pendingApprovals.single;
+
+      expect(approval.roles, [DashboardApprovalRole.requester]);
+    });
+  });
+}