feat: add UTC parsing utilities and update date handling across entities

- Introduced `utc_parser.dart` with functions to convert UTC timestamps to local time.
- Updated date parsing in various entities to use the new utility functions for consistency.
- Refactored date handling in `BenefitHistory`, `Business`, `AttendanceStatus`, `AssignedWorker`, `TimeRange`, `Invoice`, `PaymentChartPoint`, `StaffPayment`, `TimeCardEntry`, `OrderItem`, `OrderPreview`, `RecentOrder`, `StaffRating`, `CoverageDayPoint`, `ForecastWeek`, `NoShowIncident`, `SpendDataPoint`, `AssignedShift`, `CancelledShift`, `CompletedShift`, `OpenShift`, `PendingAssignment`, `Shift`, `ShiftDetail`, `TodayShift`, `BusinessMembership`, and `Staff`.
- Updated `ReorderWidget` and `OrderEditSheet` to handle date formatting correctly.

apps/mobile/packages/features/client/home/lib/src/presentation/widgets/reorder_widget.dart

@@ -75,7 +75,7 @@ class ReorderWidget extends StatelessWidget {
                                 borderRadius: UiConstants.radiusLg,
                               ),
                               child: const Icon(
-                                UiIcons.building,
+                                UiIcons.briefcase,
                                 size: 16,
                                 color: UiColors.primary,
                               ),
@@ -104,18 +104,6 @@ class ReorderWidget extends StatelessWidget {
                           ],
                         ),
                       ),
-                      // Column(
-                      //   crossAxisAlignment: CrossAxisAlignment.end,
-                      //   children: <Widget>[
-                      //     // ASSUMPTION: No i18n key for 'positions' under
-                      //     // reorder section — carrying forward existing
-                      //     // hardcoded string pattern for this migration.
-                      //     Text(
-                      //       '${order.positionCount} positions',
-                      //       style: UiTypography.footnote2r.textSecondary,
-                      //     ),
-                      //   ],
-                      // ),
                     ],
                   ),
                   const SizedBox(height: UiConstants.space3),
@@ -130,7 +118,7 @@ class ReorderWidget extends StatelessWidget {
                       ),
                       const SizedBox(width: UiConstants.space2),
                       _Badge(
-                        icon: UiIcons.building,
+                        icon: UiIcons.users,
                         text: '${order.positionCount}',
                         color: UiColors.textSecondary,
                         bg: UiColors.buttonSecondaryStill,