Refactor coverage-related widgets and improve UI consistency

- Updated CancelLateWorkerSheet to enhance layout and information display.
- Modified CoverageCalendarSelector to adjust color opacity for better visibility.
- Simplified CoveragePageSkeleton by removing unused quick stats row.
- Removed CoverageQuickStats widget as it was redundant.
- Enhanced CoverageShiftList to manage expanded state and improve worker display.
- Deleted CoverageStatCard as its functionality is no longer needed.
- Revamped CoverageStatsHeader to provide a clearer overview of coverage statistics.
- Improved LateWorkersAlert for better visual feedback on late workers.
- Redesigned ShiftHeader for a more interactive and informative shift card.
- Updated WorkerRow to streamline status display and action buttons.

apps/mobile/packages/design_system/lib/src/widgets/ui_chip.dart

@@ -82,6 +82,7 @@ class UiChip extends StatelessWidget {
 
     final Row content = Row(
       mainAxisSize: MainAxisSize.min,
+      mainAxisAlignment: MainAxisAlignment.center,
       children: <Widget>[
         if (leadingIcon != null) ...<Widget>[
           Icon(leadingIcon, size: iconSize, color: contentColor),