Update dependencies, SDKs, and target frameworks

[vb2ae]

• Bump versions for test, build, and source link dependencies
• Update MAUI projects to net10.0 and Microsoft.Maui.Controls 10.0.60
• Raise UWP target platform version to 10.0.22621.0
• Switch several projects to Microsoft.NET.Sdk
• Update WinUI3 project to latest WindowsAppSDK and SDK.BuildTools
• Add NETStandard.Library to Avalonia and Platform projects
• Replace xunit and Xunit.StaFact with latest versions and add xunit.v3
• Refactor MSBuild target syntax for compatibility
• Use Array.Empty() in Parser.cs for empty triggers
• Comment out unused UWP-specific items in Platform project

[Copilot]

Pull request overview

This PR performs a broad toolchain refresh: SDKs are moved to .NET 10 / VS2026, NuGet build/test/source-link packages are bumped, MAUI projects re-target net10.0 (Microsoft.Maui.Controls 10.0.60), the UWP uap10.0.19041 target is dropped from Caliburn.Micro.Platform, MSBuild.Sdk.Extras is replaced with Microsoft.NET.Sdk, WinUI3 is updated to WindowsAppSDK 2.0.1, xunit is migrated to v3, and CI runners are switched to windows-2025-vs2026.

Changes:

• Bump SDKs, tooling, and package versions (global.json, SourceLink, Nerdbank.GitVersioning, Test SDK, xunit→v3, NuGet, MAUI 10, WindowsAppSDK 2.0.1).
• Migrate Caliburn.Micro.Platform, Caliburn.Micro.Platform.Core, Caliburn.Micro.Core(.Tests) from MSBuild.Sdk.Extras to Microsoft.NET.Sdk; drop UWP TFM; add NETStandard.Library/Xunit.StaFact to Platform; collapse multi-line MSBuild targets to single-line with > entities; switch new TriggerBase[0] to Array.Empty<TriggerBase>().
• Update CI: GitHub Actions runners → windows-2025-vs2026, action versions bumped, setup-msbuild pinned to vs-version: '17.6'; Features.sln drops the Features.UWP project; Features.UWP raises TargetPlatformVersion to 10.0.22621.0.

Reviewed changes

Copilot reviewed 18 out of 18 changed files in this pull request and generated 5 comments.

Show a summary per file

File	Description
src/global.json	Pin SDK to 10.0.300.
src/Caliburn.Micro.Core/Caliburn.Micro.Core.csproj	Switch to Microsoft.NET.Sdk; bump SourceLink/Nerdbank.
src/Caliburn.Micro.Core.Tests/Caliburn.Micro.Core.Tests.csproj	Migrate to xunit.v3 + new test SDK; switch SDK.
src/Caliburn.Micro.Platform/Caliburn.Micro.Platform.csproj	Drop UWP TFM, switch SDK, bump SourceLink, add NETStandard.Library + Xunit.StaFact (problematic).
src/Caliburn.Micro.Platform/Parser.cs	Use Array.Empty<TriggerBase>().
src/Caliburn.Micro.Platform.Core/Caliburn.Micro.Platform.Core.csproj	Bump SourceLink/Nerdbank.
src/Caliburn.Micro.Platform.Tests/Caliburn.Micro.Platform.Tests.csproj	Migrate to xunit.v3; switch SDK; bump versions.
src/Caliburn.Micro.WinUI3/Caliburn.Micro.WinUI3.csproj	Bump WindowsAppSDK to 2.0.1 + BuildTools; add SourceLink/Nerdbank update.
src/Caliburn.Micro.Xamarin.Forms/Caliburn.Micro.Xamarin.Forms.csproj	Bump SourceLink/Nerdbank.
src/Caliburn.Micro.Maui/Caliburn.Micro.Maui.csproj	Retarget to net10.0/MAUI 10.0.60; collapse MSBuild target syntax.
src/Caliburn.Micro.Maui.Tests/Caliburn.Micro.Maui.Tests.csproj	Retarget net10.0; migrate to xunit.v3.
src/Caliburn.Micro.Avalonia/Caliburn.Micro.Avalonia.csproj	Add NETStandard.Library (unnecessary); bump SourceLink; collapse target syntax.
src/Caliburn.Micro.Avalonia.Tests/Caliburn.Micro.Avalonia.Tests.csproj	Migrate to xunit.v3 + StaFact 3.x.
samples/features/Features.UWP/Features.UWP.csproj	Raise UWP TargetPlatformVersion to 10.0.22621.0.
samples/features/Features.sln	Remove Features.UWP project + configs; bump VS version header.
azure-pipeline.yml	Switch agent to windows-2025-vs2026; .NET 10.x; NuGet 7.6.0.
.github/workflows/dotnet.yml	Update runners and action versions; pin setup-msbuild to 17.6 (incorrect for VS2026).
.github/workflows/codeql-analysis.yml	Same runner/action updates as dotnet.yml.

Comments suppressed due to low confidence (1)

src/Caliburn.Micro.Platform/Caliburn.Micro.Platform.csproj:69

• The UWP target framework (uap10.0.19041) has been removed from <TargetFrameworks>, but this ItemGroup has only been commented out rather than deleted, and its condition was also changed from uap10.0.19041 to uap10.0 which no longer matches any configured TFM. Since Caliburn.Micro.WinUI3 already pulls in Platforms\uap\**\*.cs and the UWP NuGet target is being dropped, leaving this commented block (along with the commented .rd.xml <None> on line 62 of the diff) is dead/confusing markup. Either restore the UWP target or remove the commented-out lines entirely.

  <!--<ItemGroup Condition="'$(TargetFramework)' == 'uap10.0'">
    <Compile Include="Platforms\uap\**\*.cs" />
    <PackageReference Include="Microsoft.Xaml.Behaviors.Uwp.Managed" Version="2.0.1" />
    <PackageReference Include="StrongNamer" Version="0.2.5" />
  </ItemGroup>-->

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