Fix spelling: standardize to American English 'canceled'

src/modules/powerdisplay/PowerDisplay.Lib/Utils/SimpleDebouncer.cs

@@ -90,15 +90,15 @@ private async Task DebounceAsync(Func<Task> action)
                 // Wait for quiet period
                 await Task.Delay(_delayMs, cts.Token).ConfigureAwait(false);
 
-                // Execute action if not cancelled
+                // Execute action if not canceled
                 if (!cts.Token.IsCancellationRequested)
                 {
                     await action().ConfigureAwait(false);
                 }
             }
             catch (OperationCanceledException)
             {
-                // Expected when debouncing - a newer call cancelled this one
+                // Expected when debouncing - a newer call canceled this one
             }
             catch (Exception ex)
             {

src/modules/powerdisplay/PowerDisplay/Helpers/DisplayChangeWatcher.cs

@@ -201,7 +201,7 @@ private void ScheduleDisplayChanged()
             }
             catch (OperationCanceledException)
             {
-                // Debounce was cancelled by a newer event, this is expected
+                // Debounce was canceled by a newer event, this is expected
             }
             catch (Exception ex)
             {

src/settings-ui/Settings.UI/SettingsXAML/Views/PowerDisplayPage.xaml.cs

@@ -141,7 +141,7 @@ private async void ColorTemperatureComboBox_SelectionChanged(object sender, Sele
             }
             else
             {
-                // User cancelled: revert ComboBox to previous selection (property unchanged)
+                // User canceled: revert ComboBox to previous selection (property unchanged)
                 // Use flag to prevent reentrant event handling
                 _isRestoringSelection = true;
                 try