Initial WinUI switch.

Wino.Mail.WinUI/Selectors/AccountProviderViewModelTemplateSelector.cs

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+using Microsoft.UI.Xaml;
+using Microsoft.UI.Xaml.Controls;
+using Wino.Core.ViewModels.Data;
+
+namespace Wino.Selectors;
+
+public partial class AccountProviderViewModelTemplateSelector : DataTemplateSelector
+{
+    public DataTemplate RootAccountTemplate { get; set; }
+    public DataTemplate MergedAccountTemplate { get; set; }
+
+    protected override DataTemplate SelectTemplateCore(object item, DependencyObject container)
+    {
+        if (item is MergedAccountProviderDetailViewModel)
+            return MergedAccountTemplate;
+        else
+            return RootAccountTemplate;
+    }
+}

Wino.Mail.WinUI/Selectors/AccountReorderTemplateSelector.cs

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+using Microsoft.UI.Xaml;
+using Microsoft.UI.Xaml.Controls;
+using Wino.Core.ViewModels.Data;
+
+namespace Wino.Selectors;
+
+public partial class AccountReorderTemplateSelector : DataTemplateSelector
+{
+    public DataTemplate MergedAccountReorderTemplate { get; set; }
+    public DataTemplate RootAccountReorderTemplate { get; set; }
+
+    protected override DataTemplate SelectTemplateCore(object item, DependencyObject container)
+    {
+        if (item is MergedAccountProviderDetailViewModel)
+        {
+            return MergedAccountReorderTemplate;
+        }
+
+        return RootAccountReorderTemplate;
+    }
+}

Wino.Mail.WinUI/Selectors/MailItemContainerStyleSelector.cs

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+using Microsoft.UI.Xaml;
+using Microsoft.UI.Xaml.Controls;
+using Wino.Mail.ViewModels.Data;
+
+namespace Wino.Selectors;
+
+public partial class MailItemContainerStyleSelector : StyleSelector
+{
+    public Style Thread { get; set; }
+
+    protected override Style SelectStyleCore(object item, DependencyObject container)
+    {
+        if (item is ThreadMailItemViewModel)
+            return Thread;
+        else
+            return base.SelectStyleCore(item, container);
+    }
+}

Wino.Mail.WinUI/Selectors/MailItemDisplayModePreviewTemplateSelector.cs

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+using Microsoft.UI.Xaml;
+using Microsoft.UI.Xaml.Controls;
+using Wino.Core.Domain.Enums;
+
+namespace Wino.Selectors;
+
+/// <summary>
+/// Template selector for previewing mail item display modes in Settings->Personalization page.
+/// </summary>
+public partial class MailItemDisplayModePreviewTemplateSelector : DataTemplateSelector
+{
+    public DataTemplate CompactTemplate { get; set; }
+    public DataTemplate MediumTemplate { get; set; }
+    public DataTemplate SpaciousTemplate { get; set; }
+
+    protected override DataTemplate SelectTemplateCore(object item, DependencyObject container)
+    {
+        if (item is MailListDisplayMode mode)
+        {
+            switch (mode)
+            {
+                case MailListDisplayMode.Spacious:
+                    return SpaciousTemplate;
+                case MailListDisplayMode.Medium:
+                    return MediumTemplate;
+                case MailListDisplayMode.Compact:
+                    return CompactTemplate;
+            }
+        }
+
+        return base.SelectTemplateCore(item, container);
+    }
+}

Wino.Mail.WinUI/Selectors/MailItemDisplaySelector.cs

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+using Microsoft.UI.Xaml;
+using Microsoft.UI.Xaml.Controls;
+using Wino.Mail.ViewModels.Data;
+
+namespace Wino.Selectors;
+
+public partial class MailItemDisplaySelector : DataTemplateSelector
+{
+    public DataTemplate SingleMailItemTemplate { get; set; }
+    public DataTemplate ThreadMailItemTemplate { get; set; }
+
+    protected override DataTemplate SelectTemplateCore(object item, DependencyObject container)
+    {
+        if (item is MailItemViewModel)
+            return SingleMailItemTemplate;
+        else if (item is ThreadMailItemViewModel)
+            return ThreadMailItemTemplate;
+
+        return base.SelectTemplateCore(item, container);
+    }
+}