Final refinements: fix _updateNestingLevel usage, improve comments, add volatile for thread safety

Co-authored-by: RuntimeRascal <2422222+RuntimeRascal@users.noreply.github.com>

Author: Copilot

Src/GhostDraw/Core/GlobalKeyboardHook.cs

@@ -46,7 +46,7 @@ public class GlobalKeyboardHook : IDisposable
     private List<int> _hotkeyVKs = new() { 0xA2, 0xA4, 0x44 };  // Default: Ctrl+Alt+D
     private Dictionary<int, bool> _keyStates = new();
     private bool _wasHotkeyActive = false;
-    private bool _isControlPressed = false;
+    private volatile bool _isControlPressed = false;
 
     public GlobalKeyboardHook(ILogger<GlobalKeyboardHook> logger)
     {

Src/GhostDraw/Services/ScreenshotService.cs

@@ -95,7 +95,7 @@ public void OpenSnippingTool()
         {
             _logger.LogInformation("Opening Windows Snipping Tool");
 
-            // Try SnippingTool.exe first (Windows 10)
+            // Try SnippingTool.exe first (Windows 7, 8, 10)
             var snippingToolPath = Path.Combine(
                 Environment.GetFolderPath(Environment.SpecialFolder.System),
                 "SnippingTool.exe");

Src/GhostDraw/Views/UserControls/ScreenshotSettingsControl.xaml.cs

@@ -43,11 +43,19 @@ private void Initialize(AppSettingsService appSettings)
 
     private void LoadSettings(AppSettingsService appSettings)
     {
-        var settings = appSettings.CurrentSettings;
-        SavePathTextBox.Text = settings.ScreenshotSavePath;
-        CopyToClipboardCheckBox.IsChecked = settings.CopyScreenshotToClipboard;
-        OpenFolderCheckBox.IsChecked = settings.OpenFolderAfterScreenshot;
-        PlaySoundCheckBox.IsChecked = settings.PlayShutterSound;
+        _updateNestingLevel++;
+        try
+        {
+            var settings = appSettings.CurrentSettings;
+            SavePathTextBox.Text = settings.ScreenshotSavePath;
+            CopyToClipboardCheckBox.IsChecked = settings.CopyScreenshotToClipboard;
+            OpenFolderCheckBox.IsChecked = settings.OpenFolderAfterScreenshot;
+            PlaySoundCheckBox.IsChecked = settings.PlayShutterSound;
+        }
+        finally
+        {
+            _updateNestingLevel--;
+        }
     }
 
     private void BrowseButton_Click(object sender, RoutedEventArgs e)