Refactor batch operation initialization, adjust UI defaults, and clarify skipped file handling

- Implement control disablement and `CancellationTokenSource` recreation logic at operation start.
- Default `.zip` format selected for improved user experience.
- Refine comments on skipped file handling for clarity and maintainability.

Author: drpetersonfernandes

BatchConvertToCompressedFile/MainWindow.xaml

@@ -67,8 +67,8 @@
 
                     <StackPanel Orientation="Horizontal" Margin="0,5,0,5">
                         <Label Content="Output Format:" VerticalAlignment="Center"/>
-                        <RadioButton x:Name="Format7ZRadioButton" Content=".7z" Margin="10,0,5,0" IsChecked="True" VerticalAlignment="Center"/>
-                        <RadioButton x:Name="FormatZipRadioButton" Content=".zip" Margin="5,0,5,0" VerticalAlignment="Center"/>
+                        <RadioButton x:Name="Format7ZRadioButton" Content=".7z" Margin="10,0,5,0" VerticalAlignment="Center"/>
+                        <RadioButton x:Name="FormatZipRadioButton" Content=".zip" Margin="5,0,5,0" IsChecked="True" VerticalAlignment="Center"/>
                     </StackPanel>
 
                     <CheckBox x:Name="DeleteOriginalsCheckBox" Content="Delete original files after successful compression" Margin="0,5,0,5" HorizontalAlignment="Left"/>

BatchConvertToCompressedFile/MainWindow.xaml.cs

@@ -467,10 +467,15 @@ private async void StartVerificationButton_Click(object sender, RoutedEventArgs
                 return;
             }
 
-            if (_cts.IsCancellationRequested) _cts.Dispose();
+            // 1. Disable controls immediately to prevent re-entry.
+            SetControlsState(false);
+
+            // 2. Safely recreate the CancellationTokenSource.
+            _cts?.Dispose();
             _cts = new CancellationTokenSource();
+
+            // 3. Reset stats and start the operation.
             ResetOperationStats();
-            SetControlsState(false);
             _operationTimer.Restart();
             StartWriteSpeedTracking();
             UpdateStatus("Starting batch verification...");
@@ -626,7 +631,7 @@ private async Task PerformBatchCompressionAsync(string inputFolder, string outpu
                     _failedCount++;
                     break;
                 case ProcessStatus.Skipped:
-                    // Do nothing, or you could add a "Skipped" counter.
+                    // Do nothing with counters for skipped files.
                     break;
             }
 

BatchConvertToCompressedFile/UpdateChecker.cs

@@ -106,4 +106,4 @@ public void Dispose()
         _httpClient.Dispose();
         GC.SuppressFinalize(this);
     }
-}
+}