Use Avalonia 12 preview versions for DialogHost, progress ring

Fails, likely due to dependencies relying on 11

src/Directory.Build.props

@@ -1,5 +1,5 @@
 <Project>
    <PropertyGroup>
-	   <AvaloniaVersion>11.3.12</AvaloniaVersion>
+	   <AvaloniaVersion>12.0.0-preview1</AvaloniaVersion>
    </PropertyGroup>
 </Project>

src/MayShow.csproj

@@ -42,14 +42,10 @@
     <PackageReference Include="Avalonia.Themes.Fluent" Version="$(AvaloniaVersion)" />
     <PackageReference Include="Avalonia.Fonts.Inter" Version="$(AvaloniaVersion)" />
     <PackageReference Include="Avalonia.Controls.DataGrid" Version="$(AvaloniaVersion)" />
-    <PackageReference Include="Avalonia.Diagnostics" Version="$(AvaloniaVersion)">
-      <IncludeAssets Condition="'$(Configuration)' != 'Debug'">None</IncludeAssets>
-      <PrivateAssets Condition="'$(Configuration)' != 'Debug'">All</PrivateAssets>
-    </PackageReference>
     <PackageReference Include="PDFsharp-MigraDoc" Version="6.2.3" />
     <PackageReference Include="Magick.NET-Q16-AnyCPU" Version="14.10.2" />
-    <PackageReference Include="Deadpikle.AvaloniaProgressRing" Version="0.10.11-preview20251127001" />
-    <PackageReference Include="DialogHost.Avalonia" Version="0.10.4" />
+    <PackageReference Include="Deadpikle.AvaloniaProgressRing" Version="0.11.0-preview20260220" />
+    <PackageReference Include="DialogHost.Avalonia" Version="0.10.4-avalonia12" />
     <PackageReference Include="Xaml.Behaviors.Interactions.DragAndDrop.DataGrid" Version="11.3.9.5" />
   </ItemGroup>
 </Project>