Enhanced material design 3 implementation

lib/screens/it_service_requests/it_service_requests_list_screen.dart

@@ -18,6 +18,8 @@ import '../../utils/snackbar.dart';
 import '../../widgets/m3_card.dart';
 import '../../widgets/mono_text.dart';
 import '../../widgets/reconnect_overlay.dart';
+import '../../widgets/app_page_header.dart';
+import '../../widgets/app_state_view.dart';
 import '../../widgets/responsive_body.dart';
 import '../../widgets/status_pill.dart';
 
@@ -103,17 +105,20 @@ class _ItServiceRequestsListScreenState
             child: Builder(
               builder: (context) {
                 if (requestsAsync.hasError && !requestsAsync.hasValue) {
-                  return Center(
-                    child: Text(
-                      'Failed to load requests: ${requestsAsync.error}',
-                    ),
+                  return AppErrorView(
+                    error: requestsAsync.error!,
+                    onRetry: () =>
+                        ref.invalidate(itServiceRequestsProvider),
                   );
                 }
                 final allRequests =
                     requestsAsync.valueOrNull ?? <ItServiceRequest>[];
                 if (allRequests.isEmpty && !showSkeleton) {
-                  return const Center(
-                    child: Text('No IT service requests yet.'),
+                  return const AppEmptyView(
+                    icon: Icons.miscellaneous_services_outlined,
+                    title: 'No service requests yet',
+                    subtitle:
+                        'IT service requests submitted by your team will appear here.',
                   );
                 }
                 final offices = officesAsync.valueOrNull ?? <Office>[];
@@ -146,6 +151,10 @@ class _ItServiceRequestsListScreenState
 
                 return Column(
                   children: [
+                    const AppPageHeader(
+                      title: 'IT Service Requests',
+                      subtitle: 'Manage and track IT support tickets',
+                    ),
                     // Status summary cards
                     _StatusSummaryRow(
                       requests: allRequests,