재고 상세 다이얼로그화 및 마스터 레이아웃 개선

lib/features/dashboard/presentation/pages/dashboard_page.dart

@@ -203,9 +203,11 @@ class _DashboardPageState extends State<DashboardPage> {
               return Flex(
                 direction: showSidePanel ? Axis.horizontal : Axis.vertical,
                 crossAxisAlignment: CrossAxisAlignment.start,
+                mainAxisSize: showSidePanel ? MainAxisSize.max : MainAxisSize.min,
                 children: [
-                  Expanded(
+                  Flexible(
                     flex: 3,
+                    fit: showSidePanel ? FlexFit.tight : FlexFit.loose,
                     child: _RecentTransactionsCard(
                       transactions: summary.recentTransactions,
                     ),
@@ -216,6 +218,7 @@ class _DashboardPageState extends State<DashboardPage> {
                     const SizedBox(height: 16),
                   Flexible(
                     flex: 2,
+                    fit: showSidePanel ? FlexFit.tight : FlexFit.loose,
                     child: _PendingApprovalCard(
                       approvals: summary.pendingApprovals,
                     ),