Cleaning up the solution. Separating Shared.WinRT, Services and Synchronization. Removing synchronization from app. Reducing bundle size by 45mb.

Wino.Messaging/Client/Accounts/AccountMenuItemExtended.cs

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+using System;
+using Wino.Domain.Models.MailItem;
+
+namespace Wino.Messaging.Client.Accounts
+{
+    /// <summary>
+    /// When menu item for the account is requested to be extended.
+    /// Additional properties are also supported to navigate to correct IMailItem.
+    /// </summary>
+    /// <param name="AutoSelectAccount">Account to extend menu item for.</param>
+    /// <param name="FolderId">Folder to select after expansion.</param>
+    /// <param name="NavigateMailItem">Mail item to select if possible in the expanded folder.</param>
+    public record AccountMenuItemExtended(Guid FolderId, IMailItem NavigateMailItem);
+}

Wino.Messaging/Client/Accounts/AccountMenuItemsReordered.cs

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+using System;
+using System.Collections.Generic;
+
+namespace Wino.Messaging.Client.Accounts
+{
+    /// <summary>
+    /// Emitted when account menu items are reordered.
+    /// </summary>
+    /// <param name="newOrderDictionary">New order info.</param>
+    public record AccountMenuItemsReordered(Dictionary<Guid, int> newOrderDictionary);
+}

Wino.Messaging/Client/Accounts/AccountsMenuRefreshRequested.cs

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+namespace Wino.Messaging.Client.Accounts
+{
+    /// <summary>
+    /// When a full menu refresh for accounts menu is requested.
+    /// </summary>
+    public record AccountsMenuRefreshRequested(bool AutomaticallyNavigateFirstItem = true);
+}