fix(shopinbit): defend against API contract drift

lib/models/isar/models/shopinbit_ticket.dart

@@ -16,6 +16,11 @@ class ShopInBitTicket {
   late ShopInBitCategory category;
   @enumerated
   late ShopInBitOrderStatus status;
+  // Raw API state string (e.g. "OFFER AVAILABLE") preserved alongside the
+  // mapped enum. If ShopinBit renames a state or adds a new one, the enum
+  // will read as `pending` but `statusRaw` retains the canonical string so a
+  // future client update can re-derive the correct status via migration.
+  String? statusRaw;
   late String requestDescription;
   late String deliveryCountry;
   late String? offerProductName;

lib/models/shopinbit/shopinbit_order_model.dart

@@ -113,6 +113,19 @@ class ShopInBitOrderModel extends ChangeNotifier {
     }
   }
 
+  // The most recent raw API state string, persisted alongside _status so that
+  // we can recover from contract drift (renames / new states) without losing
+  // history. _status is the parsed/mapped value; _statusRaw is the source of
+  // truth straight from the API.
+  String? _statusRaw;
+  String? get statusRaw => _statusRaw;
+  set statusRaw(String? value) {
+    if (_statusRaw != value) {
+      _statusRaw = value;
+      notifyListeners();
+    }
+  }
+
   String? _offerProductName;
   String? get offerProductName => _offerProductName;
 
@@ -236,6 +249,7 @@ class ShopInBitOrderModel extends ChangeNotifier {
       ..displayName = _displayName
       ..category = _category ?? ShopInBitCategory.concierge
       ..status = _status
+      ..statusRaw = _statusRaw
       ..requestDescription = _requestDescription
       ..deliveryCountry = _deliveryCountry
       ..offerProductName = _offerProductName
@@ -271,6 +285,7 @@ class ShopInBitOrderModel extends ChangeNotifier {
       .._apiTicketId = ticket.apiTicketId
       .._ticketId = ticket.ticketId
       .._status = ticket.status
+      .._statusRaw = ticket.statusRaw
       .._requestDescription = ticket.requestDescription
       .._deliveryCountry = ticket.deliveryCountry
       .._offerProductName = ticket.offerProductName
@@ -298,7 +313,11 @@ class ShopInBitOrderModel extends ChangeNotifier {
           .toList();
   }
 
-  static ShopInBitOrderStatus statusFromTicketState(TicketState state) {
+  // Returns null when the API state cannot be mapped (TicketState.unknown).
+  // Callers MUST treat null as "do not overwrite the locally stored status":
+  // silently coercing an unknown API state to a default (e.g. pending)
+  // would mask contract drift and look like data regression to the user.
+  static ShopInBitOrderStatus? statusFromTicketState(TicketState state) {
     switch (state) {
       case TicketState.newTicket:
         return ShopInBitOrderStatus.pending;
@@ -323,6 +342,8 @@ class ShopInBitOrderModel extends ChangeNotifier {
         return ShopInBitOrderStatus.cancelled;
       case TicketState.refunded:
         return ShopInBitOrderStatus.refunded;
+      case TicketState.unknown:
+        return null;
     }
   }
 }

lib/pages/shopinbit/shopinbit_ticket_detail.dart

@@ -134,9 +134,13 @@ class _ShopInBitTicketDetailState extends State<ShopInBitTicketDetail> {
         }
 
         if (!statusResp.hasError && statusResp.value != null) {
-          widget.model.status = ShopInBitOrderModel.statusFromTicketState(
+          final mapped = ShopInBitOrderModel.statusFromTicketState(
             statusResp.value!.state,
           );
+          // Always preserve the raw API string, even when mapping fails, so
+          // it can be recovered later.
+          widget.model.statusRaw = statusResp.value!.stateRaw;
+          if (mapped != null) widget.model.status = mapped;
         }
 
         if (widget.model.status == ShopInBitOrderStatus.offerAvailable &&

lib/pages/shopinbit/shopinbit_tickets_view.dart

@@ -127,9 +127,11 @@ class _ShopInBitTicketsViewState extends State<ShopInBitTicketsView> {
         final statusResp = await service.client.getTicketStatus(ref.id);
         if (statusResp.hasError || statusResp.value == null) continue;
 
-        _tickets[localIdx].status = ShopInBitOrderModel.statusFromTicketState(
+        final mapped = ShopInBitOrderModel.statusFromTicketState(
           statusResp.value!.state,
         );
+        _tickets[localIdx].statusRaw = statusResp.value!.stateRaw;
+        if (mapped != null) _tickets[localIdx].status = mapped;
 
         if (_tickets[localIdx].status == ShopInBitOrderStatus.offerAvailable &&
             (_tickets[localIdx].offerProductName == null ||