fix(mobile): resolve client crash and shift status inconsistency

apps/mobile/packages/features/staff/shifts/lib/src/data/repositories_impl/shifts_repository_impl.dart

@@ -186,10 +186,20 @@ class ShiftsRepositoryImpl
     final fdc.QueryResult<dc.ListShiftRolesByVendorIdData, dc.ListShiftRolesByVendorIdVariables> result = await _service.executeProtected(() => _service.connector
         .listShiftRolesByVendorId(vendorId: vendorId)
         .execute());
+    
+
+
     final allShiftRoles = result.data.shiftRoles;
 
+    // Fetch my applications to filter out already booked shifts
+    final List<Shift> myShifts = await _fetchApplications();
+    final Set<String> myShiftIds = myShifts.map((s) => s.id).toSet();
+
     final List<Shift> mappedShifts = [];
     for (final sr in allShiftRoles) {
+      // Skip if I have already applied/booked this shift
+      if (myShiftIds.contains(sr.shiftId)) continue;
+
 
       final DateTime? shiftDate = _service.toDateTime(sr.shift.date);
       final startDt = _service.toDateTime(sr.startTime);