feat: add ShiftAssignmentCard widget and StaffShifts module

- Implemented ShiftAssignmentCard widget for displaying shift assignments with client details, pay calculation, and confirmation actions.
- Created StaffShiftsModule to manage dependencies, routes, and use cases related to staff shifts.
- Added necessary dependencies in pubspec.yaml and generated pubspec.lock.

apps/mobile/packages/features/staff/shifts/pubspec.yaml

@@ -0,0 +1,33 @@
+name: staff_shifts
+description: A new Flutter package project.
+version: 0.0.1
+publish_to: 'none'
+
+environment:
+  sdk: '>=3.0.0 <4.0.0'
+  flutter: ">=3.0.0"
+
+dependencies:
+  flutter:
+    sdk: flutter
+  flutter_modular: ^6.3.2
+  flutter_bloc: ^8.1.3
+  equatable: ^2.0.5
+  intl: ^0.20.2
+  
+  # Internal packages
+  krow_core:
+    path: ../../../core
+  design_system:
+    path: ../../../design_system
+  krow_domain:
+    path: ../../../domain
+  krow_data_connect:
+    path: ../../../data_connect
+  core_localization:
+    path: ../../../core_localization
+
+dev_dependencies:
+  flutter_test:
+    sdk: flutter
+  flutter_lints: ^3.0.0