Fix packaging errors and revert test code.

Directory.Packages.props

@@ -32,6 +32,7 @@
     <PackageVersion Include="Microsoft.Identity.Client.Broker" Version="4.83.3" />
     <PackageVersion Include="Microsoft.Identity.Client.Extensions.Msal" Version="4.83.3" />
     <PackageVersion Include="Microsoft.NETCore.UniversalWindowsPlatform" Version="6.2.14" />
+    <PackageVersion Include="Microsoft.Windows.SDK.BuildTools.MSIX" Version="1.7.260316102" />
     <PackageVersion Include="Microsoft.Xaml.Behaviors.WinUI.Managed" Version="3.0.1" />
     <PackageVersion Include="Wino.Mail.Contracts" Version="1.0.18" />
     <PackageVersion Include="MimeKit" Version="4.15.1" />
@@ -39,7 +40,7 @@
     <PackageVersion Include="Nito.AsyncEx" Version="5.1.2" />
     <PackageVersion Include="Nito.AsyncEx.Tasks" Version="5.1.2" />
     <PackageVersion Include="NodaTime" Version="3.3.1" />
-    <PackageVersion Include="Sentry.Serilog" Version="6.3.0" />
+    <PackageVersion Include="Sentry.Serilog" Version="6.3.1" />
     <PackageVersion Include="Serilog" Version="4.3.1" />
     <PackageVersion Include="Serilog.Exceptions" Version="8.4.0" />
     <PackageVersion Include="Serilog.Sinks.Debug" Version="3.0.0" />
@@ -70,7 +71,7 @@
     <PackageVersion Include="Microsoft.WindowsAppSDK" Version="2.0.250930001-experimental1" />
     <PackageVersion Include="WinUIEx" Version="2.9.0" />
     <!-- Testing packages -->
-    <PackageVersion Include="Microsoft.NET.Test.Sdk" Version="18.3.0" />
+    <PackageVersion Include="Microsoft.NET.Test.Sdk" Version="18.4.0" />
     <PackageVersion Include="xunit" Version="2.9.3" />
     <PackageVersion Include="xunit.runner.visualstudio" Version="3.1.5" />
     <PackageVersion Include="FluentAssertions" Version="8.9.0" />

Wino.Mail.ViewModels/MailListPageViewModel.cs

@@ -468,14 +468,33 @@ public partial class MailListPageViewModel : MailBaseViewModel,
     }
 
     /// <summary>
-    /// Creates test notifications for the currently selected items.
+    /// Sends a new message to synchronize current folder.
     /// </summary>
     [RelayCommand]
-    private async Task SyncFolder()
+    private void SyncFolder()
     {
-        if (!CanSynchronize || MailCollection.SelectedItemsCount == 0) return;
+        if (!CanSynchronize) return;
 
-        await _notificationBuilder.CreateNotificationsAsync(MailCollection.SelectedItems.Select(a => a.MailCopy));
+        // Only synchronize listed folders.
+
+        // When doing linked inbox sync, we need to save the sync id to report progress back only once.
+        // Otherwise, we will report progress for each folder and that's what we don't want.
+
+        trackingSynchronizationId = Guid.NewGuid();
+        completedTrackingSynchronizationCount = 0;
+
+        foreach (var folder in ActiveFolder.HandlingFolders)
+        {
+            var options = new MailSynchronizationOptions()
+            {
+                AccountId = folder.MailAccountId,
+                Type = MailSynchronizationType.CustomFolders,
+                SynchronizationFolderIds = [folder.Id],
+                GroupedSynchronizationTrackingId = trackingSynchronizationId
+            };
+
+            Messenger.Send(new NewMailSynchronizationRequested(options));
+        }
     }
 
     [RelayCommand]

Wino.Mail.WinUI/Wino.Mail.WinUI.csproj

@@ -185,6 +185,10 @@
 	  
     <PackageReference Include="Microsoft.Graphics.Win2D" />
     <PackageReference Include="Microsoft.Windows.SDK.BuildTools" />
+    <PackageReference Include="Microsoft.Windows.SDK.BuildTools.MSIX">
+      <PrivateAssets>all</PrivateAssets>
+      <IncludeAssets>runtime; build; native; contentfiles; analyzers; buildtransitive</IncludeAssets>
+    </PackageReference>
     <PackageReference Include="Microsoft.WindowsAppSDK" />
 	<PackageReference Include="Microsoft.Xaml.Behaviors.WinUI.Managed" />
 	<PackageReference Include="Microsoft.Extensions.DependencyInjection" />
@@ -366,10 +370,10 @@
     <GenerateAppInstallerFile>False</GenerateAppInstallerFile>
     <AppxPackageSigningEnabled>True</AppxPackageSigningEnabled>
     <AppxPackageSigningTimestampDigestAlgorithm>SHA256</AppxPackageSigningTimestampDigestAlgorithm>
-    <AppxAutoIncrementPackageRevision>True</AppxAutoIncrementPackageRevision>
+    <AppxAutoIncrementPackageRevision>False</AppxAutoIncrementPackageRevision>
     <GenerateTestArtifacts>True</GenerateTestArtifacts>
     <AppxBundle>Always</AppxBundle>
-    <AppxBundlePlatforms>x64</AppxBundlePlatforms>
+    <AppxBundlePlatforms>x86|x64|arm64</AppxBundlePlatforms>
     <HoursBetweenUpdateChecks>0</HoursBetweenUpdateChecks>
     <PackageCertificateThumbprint>2661584A2F31D3419FFF8AA09A2C16B1991B8290</PackageCertificateThumbprint>
   </PropertyGroup>