Handling of paddle purchases and add-ons.

Wino.Mail.WinUI/Selectors/WinoAddOnTemplateSelector.cs

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+using System;
+using Microsoft.UI.Xaml;
+using Microsoft.UI.Xaml.Controls;
+using Wino.Core.Domain.Enums;
+using Wino.Core.ViewModels.Data;
+
+namespace Wino.Selectors;
+
+public partial class WinoAddOnTemplateSelector : DataTemplateSelector
+{
+    public DataTemplate? NotPurchasedTemplate { get; set; }
+    public DataTemplate? AiPackPurchasedTemplate { get; set; }
+    public DataTemplate? UnlimitedAccountsPurchasedTemplate { get; set; }
+
+    protected override DataTemplate SelectTemplateCore(object item, DependencyObject container)
+    {
+        if (item is not WinoAddOnItemViewModel addOn)
+            throw new ArgumentException(nameof(item));
+
+        if (!addOn.IsPurchased)
+            return NotPurchasedTemplate ?? throw new ArgumentException(nameof(NotPurchasedTemplate));
+
+        return addOn.ProductType switch
+        {
+            WinoAddOnProductType.AI_PACK => AiPackPurchasedTemplate ?? throw new ArgumentException(nameof(AiPackPurchasedTemplate)),
+            WinoAddOnProductType.UNLIMITED_ACCOUNTS => UnlimitedAccountsPurchasedTemplate ?? throw new ArgumentException(nameof(UnlimitedAccountsPurchasedTemplate)),
+            _ => NotPurchasedTemplate ?? throw new ArgumentException(nameof(NotPurchasedTemplate))
+        };
+    }
+}