feat: load assigned, pending, and cancelled shifts in parallel for improved performance

apps/mobile/packages/features/staff/shifts/lib/src/presentation/blocs/shifts/shifts_bloc.dart

@@ -79,16 +79,29 @@ class ShiftsBloc extends Bloc<ShiftsEvent, ShiftsState>
       emit: emit.call,
       action: () async {
         final List<DateTime> days = _getCalendarDaysForOffset(0);
-        final List<AssignedShift> myShiftsResult = await getAssignedShifts(
+
+        // Load assigned, pending, and cancelled shifts in parallel.
+        final List<Object> results = await Future.wait(<Future<Object>>[
+          getAssignedShifts(
             GetAssignedShiftsArguments(start: days.first, end: days.last),
-        );
+          ),
+          getPendingAssignments(),
+          getCancelledShifts(),
+        ]);
+
+        final List<AssignedShift> myShiftsResult =
+            results[0] as List<AssignedShift>;
+        final List<PendingAssignment> pendingResult =
+            results[1] as List<PendingAssignment>;
+        final List<CancelledShift> cancelledResult =
+            results[2] as List<CancelledShift>;
 
         emit(
           state.copyWith(
             status: ShiftsStatus.loaded,
             myShifts: myShiftsResult,
-            pendingShifts: const <PendingAssignment>[],
-            cancelledShifts: const <CancelledShift>[],
+            pendingShifts: pendingResult,
+            cancelledShifts: cancelledResult,
             availableShifts: const <OpenShift>[],
             historyShifts: const <CompletedShift>[],
             availableLoading: false,