feat(approvals): 결재 상세 전표 카드 개편

- 상단 요약부를 전용 Highlight 카드로 교체하고 출발지/도착지 및 라인 품목 정보를 한 화면에서 제공
- 결재 상세 다이얼로그에 통화 포매터를 연결하고 새 카드 위젯을 포함해 금액·수량을 명시적으로 표현
- 입고/출고/대여 별 라우팅/품목 정보를 검증하는 위젯 테스트를 추가해 회귀 안정성을 확보

lib/features/approvals/presentation/dialogs/approval_detail_dialog.dart

@@ -11,6 +11,7 @@ import '../../../../widgets/components/superport_detail_dialog.dart';
 import '../../domain/entities/approval.dart';
 import '../../domain/entities/approval_template.dart';
 import '../../presentation/controllers/approval_controller.dart';
+import '../widgets/approval_transaction_highlight_card.dart';
 import '../../../inventory/transactions/domain/entities/stock_transaction.dart';
 
 /// 결재 상세 다이얼로그를 표시한다.
@@ -89,6 +90,11 @@ class ApprovalDetailDialogView extends StatefulWidget {
 
 class _ApprovalDetailDialogViewState extends State<ApprovalDetailDialogView> {
   int? _selectedTemplateId;
+  late final intl.NumberFormat _currencyFormatter = intl.NumberFormat.currency(
+    locale: 'ko_KR',
+    symbol: '₩',
+    decimalDigits: 0,
+  );
 
   @override
   void initState() {
@@ -441,23 +447,38 @@ class _ApprovalDetailDialogViewState extends State<ApprovalDetailDialogView> {
           );
         }
 
+        final highlightCard =
+            (isTransactionLoading ||
+                transaction != null ||
+                transactionError != null)
+            ? ApprovalTransactionHighlightCard(
+                key: const ValueKey('approval_transaction_highlight_card'),
+                transaction: transaction,
+                isLoading: isTransactionLoading,
+                errorMessage: transactionError,
+                currencyFormatter: _currencyFormatter,
+                dateFormat: widget.dateFormat,
+              )
+            : null;
+        final summaryChildren = <Widget>[
+          if (highlightCard != null) ...[
+            highlightCard,
+            const SizedBox(height: 16),
+          ],
+          Text('결재번호 ${approval.approvalNo}', style: theme.textTheme.h4),
+          const SizedBox(height: 4),
+          Text('트랜잭션 ${approval.transactionNo}', style: theme.textTheme.muted),
+          if (transaction != null) ...[
+            const SizedBox(height: 2),
+            Text(
+              '${transaction.type.name} · ${transaction.warehouse.name}',
+              style: theme.textTheme.small,
+            ),
+          ],
+        ];
         final summary = Column(
           crossAxisAlignment: CrossAxisAlignment.start,
-          children: [
-            Text('결재번호 ${approval.approvalNo}', style: theme.textTheme.h4),
-            const SizedBox(height: 4),
-            Text(
-              '트랜잭션 ${approval.transactionNo}',
-              style: theme.textTheme.muted,
-            ),
-            if (transaction != null) ...[
-              const SizedBox(height: 2),
-              Text(
-                '${transaction.type.name} · ${transaction.warehouse.name}',
-                style: theme.textTheme.small,
-              ),
-            ],
-          ],
+          children: summaryChildren,
         );
         final summaryBadges = _buildSummaryBadges(approval, transaction);
         final metadata = _buildMetadata(