Fix system tray tooltip crash in both editions

Dashboard/App.xaml.cs

@@ -95,6 +95,16 @@ private void OnUnhandledException(object sender, UnhandledExceptionEventArgs e)
 
         private void OnDispatcherUnhandledException(object sender, DispatcherUnhandledExceptionEventArgs e)
         {
+            /* Silently swallow Hardcodet TrayToolTip race condition (issue #422).
+               The crash occurs in Popup.CreateWindow when showing the custom visual tooltip
+               and is harmless — the tooltip simply doesn't show that one time. */
+            if (IsTrayToolTipCrash(e.Exception))
+            {
+                Logger.Warning("Suppressed Hardcodet TrayToolTip crash (issue #422)");
+                e.Handled = true;
+                return;
+            }
+
             Logger.Error("Unhandled Dispatcher Exception", e.Exception);
 
             MessageBox.Show(
@@ -114,6 +124,16 @@ private void OnUnobservedTaskException(object? sender, UnobservedTaskExceptionEv
             e.SetObserved(); // Prevent process termination
         }
 
+        /// <summary>
+        /// Detects the Hardcodet TrayToolTip race condition crash (issue #422).
+        /// </summary>
+        private static bool IsTrayToolTipCrash(Exception ex)
+        {
+            return ex is ArgumentException
+                && ex.Message.Contains("VisualTarget")
+                && ex.StackTrace?.Contains("TaskbarIcon") == true;
+        }
+
         private void CreateCrashDump(Exception? exception)
         {
             try

Dashboard/Services/NotificationService.cs

@@ -44,7 +44,10 @@ public void Initialize()
 
             bool HasLightBackground = Helpers.ThemeManager.HasLightBackground;
 
-            /* Custom tooltip styled to match current theme */
+            /* Custom tooltip styled to match current theme.
+               Note: Hardcodet TrayToolTip can rarely trigger a race condition in Popup.CreateWindow
+               that throws "The root Visual of a VisualTarget cannot have a parent." (issue #422).
+               The DispatcherUnhandledException handler silently swallows this specific crash. */
             _trayIcon.TrayToolTip = new Border
             {
                 Background = new SolidColorBrush(HasLightBackground

Lite/App.xaml.cs

@@ -324,6 +324,16 @@ private void OnUnhandledException(object sender, UnhandledExceptionEventArgs e)
 
     private void OnDispatcherUnhandledException(object sender, DispatcherUnhandledExceptionEventArgs e)
     {
+        /* Silently swallow Hardcodet TrayToolTip race condition (issue #422).
+           The crash occurs in Popup.CreateWindow when showing the custom visual tooltip
+           and is harmless — the tooltip simply doesn't show that one time. */
+        if (IsTrayToolTipCrash(e.Exception))
+        {
+            AppLogger.Warn("Dispatcher", "Suppressed Hardcodet TrayToolTip crash (issue #422)");
+            e.Handled = true;
+            return;
+        }
+
         AppLogger.Error("Dispatcher", "Unhandled exception", e.Exception);
         AppLogger.Flush();
 
@@ -344,6 +354,16 @@ private void OnUnobservedTaskException(object? sender, UnobservedTaskExceptionEv
         e.SetObserved(); /* Prevent process termination */
     }
 
+    /// <summary>
+    /// Detects the Hardcodet TrayToolTip race condition crash (issue #422).
+    /// </summary>
+    private static bool IsTrayToolTipCrash(Exception ex)
+    {
+        return ex is System.ArgumentException
+            && ex.Message.Contains("VisualTarget")
+            && ex.StackTrace?.Contains("TaskbarIcon") == true;
+    }
+
     private static string FormatExceptionDetails(Exception? ex)
     {
         if (ex == null) return "Unknown error";

Lite/Services/SystemTrayService.cs

@@ -45,7 +45,10 @@ public void Initialize()
 
         bool HasLightBackground = Helpers.ThemeManager.HasLightBackground;
 
-        /* Custom tooltip styled to match current theme */
+        /* Custom tooltip styled to match current theme.
+           Note: Hardcodet TrayToolTip can rarely trigger a race condition in Popup.CreateWindow
+           that throws "The root Visual of a VisualTarget cannot have a parent." (issue #422).
+           The DispatcherUnhandledException handler silently swallows this specific crash. */
         _tooltipText = new TextBlock
         {
             Text = "Performance Monitor Lite",