Global back listener for mouse.

Wino.Mail.WinUI/Services/NavigationService.cs

@@ -221,18 +221,18 @@ public class NavigationService : NavigationServiceBase, INavigationService
             return;
         }
 
-        if (_statePersistanceService.ApplicationMode == WinoApplicationMode.Calendar)
-        {
         var innerShellFrame = GetCoreFrame(NavigationReferenceFrame.InnerShellFrame);
-            if (innerShellFrame?.CanGoBack == true)
+
+        if (_statePersistanceService.ApplicationMode == WinoApplicationMode.Calendar && innerShellFrame?.CanGoBack == true)
         {
             innerShellFrame.GoBack();
 
             // Calendar mode: Navigate back from EventDetailsPage
             _statePersistanceService.IsEventDetailsVisible = false;
         }
-        }
         else
+        {
+            if (_statePersistanceService.IsReadingMail && _statePersistanceService.IsReaderNarrowed)
             {
                 // Mail mode: Clear selections and dispose rendering frame
                 _statePersistanceService.IsReadingMail = false;
@@ -240,6 +240,11 @@ public class NavigationService : NavigationServiceBase, INavigationService
                 WeakReferenceMessenger.Default.Send(new ClearMailSelectionsRequested());
                 WeakReferenceMessenger.Default.Send(new DisposeRenderingFrameRequested());
             }
+            else if (innerShellFrame != null && innerShellFrame.CanGoBack)
+            {
+                innerShellFrame.GoBack();
+            }
+        }
     }
 
     // Standalone EML viewer.

Wino.Mail.WinUI/ShellWindow.xaml.cs

@@ -41,6 +41,9 @@ public sealed partial class ShellWindow : WindowEx, IWinoShellWindow, IRecipient
         // Use the AppWindow.Closing event to handle the close request
         AppWindow.Closing += OnAppWindowClosing;
 
+        // Register global mouse button listener for back button
+        RegisterMouseBackButtonListener();
+
         ShowWinoCommand = new RelayCommand(RestoreFromTray);
         ExitWinoCommand = new RelayCommand(ForceClose);
 
@@ -66,6 +69,30 @@ public sealed partial class ShellWindow : WindowEx, IWinoShellWindow, IRecipient
         }
     }
 
+    private void RegisterMouseBackButtonListener()
+    {
+        // Subscribe to pointer pressed events on the root content
+        if (Content is UIElement rootElement)
+        {
+            rootElement.AddHandler(UIElement.PointerPressedEvent, new Microsoft.UI.Xaml.Input.PointerEventHandler(OnPointerPressed), true);
+        }
+    }
+
+    private void OnPointerPressed(object sender, Microsoft.UI.Xaml.Input.PointerRoutedEventArgs e)
+    {
+        // Check if it's the back button (XButton1)
+        var pointerPoint = e.GetCurrentPoint(null);
+        var properties = pointerPoint.Properties;
+
+        // XButton1 is the back button on most mice
+        if (properties.IsXButton1Pressed)
+        {
+            // Call GoBack on NavigationService
+            NavigationService.GoBack();
+            e.Handled = true;
+        }
+    }
+
     public void HandleAppActivation(LaunchActivatedEventArgs args)
     {
         // Parse launch arguments to determine the application mode