feat(dialog): 상세 팝업 SuperportDetailDialog 통합

- SuperportDetailDialog 위젯과 showSuperportDetailDialog 헬퍼를 추가하고 metadata/섹션 패턴을 표준화

- 결재/재고/마스터 각 상세 다이얼로그를 dialogs 디렉터리에 신설하고 기존 페이지를 신규 팝업으로 전환

- SuperportTable 행 선택과 우편번호 검색 다이얼로그 onRowTap 보정을 통해 헤더 오프셋 버그를 제거

- 상세 다이얼로그 및 트랜잭션/상세 뷰 전용 위젯 테스트와 tester_extensions 유틸을 추가하여 회귀를 방지

- detail_dialog_unification_plan.md로 작업 배경과 필드 통합 계획을 문서화

test/features/masters/group/presentation/dialogs/group_detail_dialog_test.dart

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+import 'dart:async';
+
+import 'package:flutter/material.dart';
+import 'package:flutter_test/flutter_test.dart';
+import 'package:intl/intl.dart' as intl;
+import 'package:shadcn_ui/shadcn_ui.dart';
+
+import 'package:superport_v2/features/masters/group/domain/entities/group.dart';
+import 'package:superport_v2/features/masters/group/presentation/dialogs/group_detail_dialog.dart';
+
+import '../../../../../helpers/test_app.dart';
+
+void main() {
+  final dateFormat = intl.DateFormat('yyyy-MM-dd HH:mm');
+
+  Future<Group?> noopCreate(GroupInput _) async => null;
+  Future<Group?> noopUpdate(int _, GroupInput __) async => null;
+  Future<bool> noopDelete(int _) async => false;
+  Future<Group?> noopRestore(int _) async => null;
+
+  testWidgets('showGroupDetailDialog 등록 모드 폼을 노출한다', (tester) async {
+    await tester.binding.setSurfaceSize(const Size(960, 720));
+    addTearDown(() => tester.binding.setSurfaceSize(null));
+
+    await tester.pumpWidget(buildTestApp(const SizedBox.shrink()));
+    final context = tester.element(find.byType(SizedBox));
+
+    unawaited(
+      showGroupDetailDialog(
+        context: context,
+        dateFormat: dateFormat,
+        onCreate: noopCreate,
+        onUpdate: noopUpdate,
+        onDelete: noopDelete,
+        onRestore: noopRestore,
+      ),
+    );
+
+    await tester.pumpAndSettle();
+
+    expect(find.text('그룹 등록'), findsOneWidget);
+    expect(find.text('그룹명'), findsOneWidget);
+    expect(find.text('설명'), findsOneWidget);
+    expect(find.widgetWithText(ShadButton, '등록'), findsWidgets);
+  });
+
+  testWidgets('showGroupDetailDialog 상세 모드는 요약과 메타데이터를 제공한다', (tester) async {
+    await tester.binding.setSurfaceSize(const Size(1280, 800));
+    addTearDown(() => tester.binding.setSurfaceSize(null));
+
+    final group = Group(
+      id: 12,
+      groupName: '운영팀',
+      description: '운영 담당',
+      isDefault: false,
+      isActive: true,
+      isDeleted: false,
+      note: '연중무휴',
+      createdAt: DateTime(2024, 2, 1, 9),
+      updatedAt: DateTime(2024, 3, 1, 10),
+    );
+
+    await tester.pumpWidget(buildTestApp(const SizedBox.shrink()));
+    final context = tester.element(find.byType(SizedBox));
+
+    unawaited(
+      showGroupDetailDialog(
+        context: context,
+        dateFormat: dateFormat,
+        group: group,
+        onCreate: noopCreate,
+        onUpdate: noopUpdate,
+        onDelete: noopDelete,
+        onRestore: noopRestore,
+      ),
+    );
+
+    await tester.pumpAndSettle();
+
+    expect(find.text('그룹 상세'), findsWidgets);
+    expect(find.text('운영팀'), findsWidgets);
+    expect(find.text('운영 담당'), findsWidgets);
+    expect(find.text('기본 여부'), findsWidgets);
+    expect(find.text('사용 여부'), findsWidgets);
+    expect(find.text('삭제'), findsOneWidget);
+  });
+
+  testWidgets('삭제 섹션에서 경고와 버튼 상태를 노출한다', (tester) async {
+    await tester.binding.setSurfaceSize(const Size(1280, 800));
+    addTearDown(() => tester.binding.setSurfaceSize(null));
+
+    final group = Group(
+      id: 20,
+      groupName: '삭제 대상',
+      isDefault: false,
+      isActive: true,
+      isDeleted: false,
+      createdAt: DateTime(2024, 1, 10, 8),
+      updatedAt: DateTime(2024, 1, 12, 9),
+    );
+
+    await tester.pumpWidget(buildTestApp(const SizedBox.shrink()));
+    final context = tester.element(find.byType(SizedBox));
+
+    unawaited(
+      showGroupDetailDialog(
+        context: context,
+        dateFormat: dateFormat,
+        group: group,
+        onCreate: noopCreate,
+        onUpdate: noopUpdate,
+        onDelete: (_) async => true,
+        onRestore: noopRestore,
+      ),
+    );
+
+    await tester.pumpAndSettle();
+
+    final deleteTab = find.text('삭제').first;
+    await tester.tap(deleteTab, warnIfMissed: false);
+    await tester.pumpAndSettle();
+
+    expect(find.textContaining('삭제하면'), findsOneWidget);
+
+    final dialog = find.byType(Dialog);
+    final deleteButton = find
+        .descendant(
+          of: dialog,
+          matching: find.widgetWithText(ShadButton, '삭제', skipOffstage: false),
+        )
+        .first;
+    final buttonWidget = tester.widget<ShadButton>(deleteButton);
+    expect(buttonWidget.onPressed, isNotNull);
+  });
+}