refactor: remove redundant notifyListeners in HomeViewModel deleteBooking (#2839)

Removes redundant notifyListeners() call from _deleteBooking().

The method is executed through Command, which already manages its own
notifyListeners lifecycle. This change ensures that HomeViewModel
only notifies listeners when its internal state (_bookings) changes,
avoiding unnecessary updates.

Fixes https://github.com/flutter/samples/issues/2746

## Pre-launch Checklist

- [x] I read the [Flutter Style Guide] recently, and have followed its
advice.
- [x] I signed the [CLA].
- [ ] I have added sample code updates to the [changelog].
- [ ] I updated/added relevant documentation (doc comments with `///`).

<!-- Links -->
[Flutter Style Guide]:
https://github.com/flutter/flutter/blob/master/docs/contributing/Style-guide-for-Flutter-repo.md
[CLA]: https://cla.developers.google.com/
[changelog]: ./CHANGELOG.md

Co-authored-by: Eric Windmill <eric@ericwindmill.com>

compass_app/app/lib/ui/home/view_models/home_viewmodel.dart

@@ -65,31 +65,27 @@ class HomeViewModel extends ChangeNotifier {
   }
 
   Future<Result<void>> _deleteBooking(int id) async {
-    try {
-      final resultDelete = await _bookingRepository.delete(id);
-      switch (resultDelete) {
-        case Ok<void>():
-          _log.fine('Deleted booking $id');
-        case Error<void>():
-          _log.warning('Failed to delete booking $id', resultDelete.error);
-          return resultDelete;
-      }
-
-      // After deleting the booking, we need to reload the bookings list.
-      // BookingRepository is the source of truth for bookings.
-      final resultLoadBookings = await _bookingRepository.getBookingsList();
-      switch (resultLoadBookings) {
-        case Ok<List<BookingSummary>>():
-          _bookings = resultLoadBookings.value;
-          _log.fine('Loaded bookings');
-        case Error<List<BookingSummary>>():
-          _log.warning('Failed to load bookings', resultLoadBookings.error);
-          return resultLoadBookings;
-      }
+    final resultDelete = await _bookingRepository.delete(id);
+    switch (resultDelete) {
+      case Ok<void>():
+        _log.fine('Deleted booking $id');
+      case Error<void>():
+        _log.warning('Failed to delete booking $id', resultDelete.error);
+        return resultDelete;
+    }
 
-      return resultLoadBookings;
-    } finally {
-      notifyListeners();
+    // After deleting the booking, reload the bookings list.
+    final resultLoadBookings = await _bookingRepository.getBookingsList();
+    switch (resultLoadBookings) {
+      case Ok<List<BookingSummary>>():
+        _bookings = resultLoadBookings.value;
+        _log.fine('Loaded bookings');
+        notifyListeners(); // notify only when data changes
+      case Error<List<BookingSummary>>():
+        _log.warning('Failed to load bookings', resultLoadBookings.error);
+        return resultLoadBookings;
     }
+
+    return resultLoadBookings;
   }
 }