feat: Enhance shift filtering logic and update header text style for improved UI

apps/mobile/packages/features/staff/home/lib/src/data/repositories/home_repository_impl.dart

@@ -63,7 +63,15 @@ class HomeRepositoryImpl implements HomeRepository {
       final response = await ExampleConnector.instance.listShifts().execute();
 
       return response.data.shifts
-          .where((s) => s.status is Known && (s.status as Known).value == ShiftStatus.OPEN) 
+          .where((s) {
+            final isOpen = s.status is Known && (s.status as Known).value == ShiftStatus.OPEN;
+            if (!isOpen) return false;
+
+            final start = s.startTime?.toDate();
+            if (start == null) return false;
+
+            return start.isAfter(DateTime.now());
+          }) 
           .take(10)
           .map((s) => _mapConnectorShiftToDomain(s))
           .toList();

apps/mobile/packages/features/staff/home/lib/src/presentation/widgets/home_page/home_header.dart

@@ -53,9 +53,7 @@ class HomeHeader extends StatelessWidget {
             children: [
               Text(
                 headerI18n.welcome_back,
-                style: UiTypography.body3r.copyWith(
-                  color: UiColors.mutedForeground,
-                ),
+                style: UiTypography.body3r.textSecondary,
               ),
               Text(nameToDisplay, style: UiTypography.headline4m),
             ],