재고 상세 다이얼로그화 및 마스터 레이아웃 개선

test/features/masters/vendor/presentation/pages/vendor_page_test.dart

@@ -216,4 +216,40 @@ void main() {
     expect(find.text('NV-001'), findsOneWidget);
     verify(() => repository.create(any())).called(1);
   });
+
+  testWidgets('좁은 폭에서도 오버플로 없이 렌더링', (tester) async {
+    dotenv.testLoad(fileInput: 'FEATURE_VENDORS_ENABLED=true\n');
+    final repository = _MockVendorRepository();
+    GetIt.I.registerLazySingleton<VendorRepository>(() => repository);
+
+    when(
+      () => repository.list(
+        page: any(named: 'page'),
+        pageSize: any(named: 'pageSize'),
+        query: any(named: 'query'),
+        isActive: any(named: 'isActive'),
+      ),
+    ).thenAnswer(
+      (_) async => PaginatedResult<Vendor>(
+        items: [Vendor(id: 1, vendorCode: 'V-SMALL', vendorName: '좁은 화면 벤더')],
+        page: 1,
+        pageSize: 20,
+        total: 1,
+      ),
+    );
+
+    await tester.pumpWidget(
+      _buildApp(
+        Center(
+          child: SizedBox(
+            width: 260,
+            child: VendorPage(routeUri: Uri(path: '/masters/vendors')),
+          ),
+        ),
+      ),
+    );
+    await tester.pumpAndSettle();
+
+    expect(tester.takeException(), isNull);
+  });
 }