Fixing outlook attachments, re-using compose page and some additional fixes on the mime headers for outlook.

Wino.Mail.WinUI/Services/NavigationService.cs

@@ -185,6 +185,15 @@ public class NavigationService : NavigationServiceBase, INavigationService
                     {
                         WeakReferenceMessenger.Default.Send(new NewMailItemRenderingRequestedEvent(mailItemViewModel));
                     }
+                    else if (listingFrame.Content != null
+                        && listingFrame.Content.GetType() == GetPageType(WinoPage.ComposePage)
+                        && page == WinoPage.ComposePage
+                        && parameter is MailItemViewModel composeDraftViewModel)
+                    {
+                        // ComposePage is already active and we're switching to another draft.
+                        // Reuse existing ComposePage and WebView2 instead of navigating.
+                        WeakReferenceMessenger.Default.Send(new NewComposeDraftItemRequestedEvent(composeDraftViewModel));
+                    }
                     else if (listingFrame.Content != null
                         && listingFrame.Content.GetType() == GetPageType(WinoPage.IdlePage)
                         && pageType == typeof(IdlePage))

Wino.Mail.WinUI/Views/Mail/ComposePage.xaml.cs

@@ -21,6 +21,7 @@ using Wino.Core.Domain;
 using Wino.Core.Domain.Entities.Shared;
 using Wino.Core.Domain.Models.Reader;
 using Wino.Mail.ViewModels.Data;
+using Wino.Mail.ViewModels.Messages;
 using Wino.Mail.WinUI.Extensions;
 using Wino.Messaging.Client.Mails;
 using Wino.Messaging.Client.Shell;
@@ -30,7 +31,8 @@ namespace Wino.Views.Mail;
 
 public sealed partial class ComposePage : ComposePageAbstract,
     IRecipient<CreateNewComposeMailRequested>,
-    IRecipient<ApplicationThemeChanged>
+    IRecipient<ApplicationThemeChanged>,
+    IRecipient<NewComposeDraftItemRequestedEvent>
 {
     public WebView2 GetWebView() => WebViewEditor.GetUnderlyingWebView();
 
@@ -300,6 +302,12 @@ public sealed partial class ComposePage : ComposePageAbstract,
         WebViewEditor.IsEditorDarkMode = message.IsUnderlyingThemeDark;
     }
 
+    void IRecipient<NewComposeDraftItemRequestedEvent>.Receive(NewComposeDraftItemRequestedEvent message)
+    {
+        // Reset the initial focus flag so ToBox gets focus for the new draft.
+        isInitialFocusHandled = false;
+    }
+
     private void ImportanceClicked(object sender, RoutedEventArgs e)
     {
         ImportanceFlyout.Hide();
@@ -415,6 +423,7 @@ public sealed partial class ComposePage : ComposePageAbstract,
 
         WeakReferenceMessenger.Default.Register<CreateNewComposeMailRequested>(this);
         WeakReferenceMessenger.Default.Register<ApplicationThemeChanged>(this);
+        WeakReferenceMessenger.Default.Register<NewComposeDraftItemRequestedEvent>(this);
     }
 
     protected override void UnregisterRecipients()
@@ -423,6 +432,7 @@ public sealed partial class ComposePage : ComposePageAbstract,
 
         WeakReferenceMessenger.Default.Unregister<CreateNewComposeMailRequested>(this);
         WeakReferenceMessenger.Default.Unregister<ApplicationThemeChanged>(this);
+        WeakReferenceMessenger.Default.Unregister<NewComposeDraftItemRequestedEvent>(this);
     }
 
     // TODO: Save mime on closing the app.

Wino.Mail.WinUI/Views/Mail/MailListPage.xaml.cs

@@ -262,8 +262,9 @@ public sealed partial class MailListPage : MailListPageAbstract,
                 }
                 else if (IsComposingPageActive())
                 {
-                    // Composer is already active. Prepare composer WebView2 animation.
-                    PrepareComposePageWebViewTransition();
+                    // Composer is already active. Skip connected animation since the page
+                    // will be reused in-place (no navigation occurs).
+                    // NavigationService will send NewComposeDraftItemRequestedEvent instead.
                 }
                 else
                     composerPageTransition = NavigationTransitionType.DrillIn;