feat: Add event name to order items and refactor navigation and shift data access to use direct object properties.

apps/mobile/packages/domain/lib/src/entities/orders/order_item.dart

@@ -23,6 +23,7 @@ class OrderItem extends Equatable {
     required this.filled,
     required this.workersNeeded,
     required this.hourlyRate,
+    required this.eventName,
     this.hours = 0,
     this.totalValue = 0,
     this.confirmedApps = const <Map<String, dynamic>>[],
@@ -76,6 +77,9 @@ class OrderItem extends Equatable {
   /// Total value for the shift role.
   final double totalValue;
 
+  /// Name of the event.
+  final String eventName;
+
   /// List of confirmed worker applications.
   final List<Map<String, dynamic>> confirmedApps;
 
@@ -97,6 +101,7 @@ class OrderItem extends Equatable {
     hourlyRate,
     hours,
     totalValue,
+    eventName,
     confirmedApps,
   ];
 }