Refactor shift history and my shifts tabs to use a unified ShiftCard widget

- Introduced ShiftCard widget to standardize the display of shift information across different states (assigned, completed, cancelled, pending).
- Removed redundant card implementations (_CompletedShiftCard, MyShiftCard, ShiftAssignmentCard) and replaced them with ShiftCard.
- Updated localization for empty states and shift titles in HistoryShiftsTab and MyShiftsTab.
- Enhanced MyShiftsTab to track submitted shifts locally and show appropriate actions based on shift status.
- Added meta package dependency for improved type annotations.

apps/mobile/packages/domain/lib/src/entities/shifts/completed_shift.dart

@@ -1,6 +1,5 @@
 import 'package:equatable/equatable.dart';
-
-import 'package:krow_domain/src/entities/enums/payment_status.dart';
+import 'package:krow_domain/krow_domain.dart';
 
 /// A shift the staff member has completed.
 ///
@@ -16,6 +15,7 @@ class CompletedShift extends Equatable {
     required this.date,
     required this.minutesWorked,
     required this.paymentStatus,
+    required this.status,
   });
 
   /// Deserialises from the V2 API JSON response.
@@ -28,6 +28,7 @@ class CompletedShift extends Equatable {
       date: DateTime.parse(json['date'] as String),
       minutesWorked: json['minutesWorked'] as int? ?? 0,
       paymentStatus: PaymentStatus.fromJson(json['paymentStatus'] as String?),
+      status: AssignmentStatus.completed,
     );
   }
 
@@ -52,6 +53,9 @@ class CompletedShift extends Equatable {
   /// Payment processing status.
   final PaymentStatus paymentStatus;
 
+  /// Assignment status (should always be `completed` for this class).
+  final AssignmentStatus status;
+
   /// Serialises to JSON.
   Map<String, dynamic> toJson() {
     return <String, dynamic>{