feat: add benefit history feature with lazy loading and pagination

- Implemented `getBenefitsHistory` method in `HomeRepository` to retrieve paginated benefit history.
- Enhanced `BenefitsOverviewCubit` to manage loading and displaying benefit history.
- Created `BenefitHistoryPage` for full-screen display of benefit history with infinite scroll support.
- Added `BenefitHistoryPreview` widget for expandable history preview in benefit cards.
- Introduced `BenefitHistoryRow` to display individual history records.
- Updated `BenefitsOverviewState` to include history management fields.
- Added new entities and use cases for handling benefit history.
- Created design system documentation for UI patterns and known gaps.

apps/mobile/packages/core/lib/src/routing/staff/navigator.dart

@@ -60,6 +60,20 @@ extension StaffNavigator on IModularNavigator {
     safePush(StaffPaths.benefits);
   }
 
+  /// Navigates to the full history page for a specific benefit.
+  void toBenefitHistory({
+    required String benefitId,
+    required String benefitTitle,
+  }) {
+    safePush(
+      StaffPaths.benefitHistory,
+      arguments: <String, dynamic>{
+        'benefitId': benefitId,
+        'benefitTitle': benefitTitle,
+      },
+    );
+  }
+
   void toStaffMain() {
     safePushNamedAndRemoveUntil('${StaffPaths.main}/home/', (_) => false);
   }

apps/mobile/packages/core/lib/src/routing/staff/route_paths.dart

@@ -75,6 +75,9 @@ class StaffPaths {
   /// Benefits overview page.
   static const String benefits = '/worker-main/home/benefits';
 
+  /// Benefit history page for a specific benefit.
+  static const String benefitHistory = '/worker-main/home/benefits/history';
+
   /// Shifts tab - view and manage shifts.
   ///
   /// Browse available shifts, accepted shifts, and shift history.