New startup window.

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

@@ -1,3 +1,5 @@
+using Microsoft.UI.Xaml;
+using Microsoft.UI.Xaml.Controls;
 using CommunityToolkit.WinUI.Controls;
 using Wino.Views.Abstract;
 
@@ -5,12 +7,19 @@ namespace Wino.Views;
 
 public sealed partial class WelcomePage : WelcomePageAbstract
 {
-    private readonly MarkdownConfig _config;
-
     public WelcomePage()
     {
         InitializeComponent();
+    }
 
-        _config = new MarkdownConfig();
+    private void OnTabSelectionChanged(object sender, SelectionChangedEventArgs e)
+    {
+        if (sender is not Segmented segmented)
+            return;
+
+        bool isFeaturesTab = segmented.SelectedIndex == 0;
+
+        FeaturesFlipView.Visibility = isFeaturesTab ? Visibility.Visible : Visibility.Collapsed;
+        WhatsNewFlipView.Visibility = isFeaturesTab ? Visibility.Collapsed : Visibility.Visible;
     }
 }