CloudMirror: Add x64 support and update for Visual Studio 2026

[kiruba94]

Summary

Updates the Cloud Mirror sample to support x64 builds and modern Visual Studio versions (2019, 2022, 2026), while maintaining backward compatibility.

Changes

x64 platform support

• Updated AppxBundlePlatforms from x86 to x86|x64 in the packaging project, enabling MSIX package generation for both architectures.

Visual Studio 2026 compatibility

• Added PlatformToolset conditional for VS 2026 (v145 when VisualStudioVersion >= 18.0), alongside the existing v142 (VS 2019) default and v143 (VS 2022) conditional.
• Updated solution file header to Visual Studio 18.

SDK and dependency updates

• Updated TargetPlatformVersion from 10.0.22598.0 to 10.0.26100.0 (Windows SDK 10.0.26100.0).
• Updated MaxVersionTested in Package.appxmanifest to 10.0.26100.0.
• Upgraded Microsoft.Windows.CppWinRT NuGet package from 2.0.220110.5 to 2.0.250303.1.

README updates

• Replaced x86-only build instructions with x86/x64 guidance.
• Updated Visual Studio version references from VS 2017 to VS 2019/2022/2026.
• Corrected minimum SDK version from 10.0.17763.0 to 10.0.22598.0 (matching the existing compile-time check in stdafx.h).

Backward compatibility

The project remains buildable with Visual Studio 2019 (v142 default toolset) and Visual Studio 2022 (v143 conditional). The MinimumVisualStudioVersion is unchanged at 10.0.40219.1.

Testing

Verified successful builds for both x86 and x64 (Debug and Release) on Visual Studio 2026 (v18.3, MSBuild 18.3.0, toolset v145).

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