UI fields for cost center

apps/mobile/packages/domain/lib/src/entities/business/hub.dart

@@ -14,7 +14,6 @@ enum HubStatus {
 
 /// Represents a branch location or operational unit within a [Business].
 class Hub extends Equatable {
-
   const Hub({
     required this.id,
     required this.businessId,
@@ -22,6 +21,7 @@ class Hub extends Equatable {
     required this.address,
     this.nfcTagId,
     required this.status,
+    this.costCenter,
   });
   /// Unique identifier.
   final String id;
@@ -41,6 +41,9 @@ class Hub extends Equatable {
   /// Operational status.
   final HubStatus status;
 
+  /// Assigned cost center for this hub.
+  final String? costCenter;
+
   @override
-  List<Object?> get props => <Object?>[id, businessId, name, address, nfcTagId, status];
+  List<Object?> get props => <Object?>[id, businessId, name, address, nfcTagId, status, costCenter];
 }