Upgrade to .NET 10 and latest NuGet packages

[Copilot]

Upgrades the application from .NET 6.0 (end-of-life) to .NET 10.0 and updates all NuGet packages to their latest versions.

Framework & Package Updates

• Target Framework: net6.0 → net10.0 (all 5 projects)
• ASP.NET Core packages: 6.0.11/7.0.0 → 10.0.2
• MSTest packages: 2.2.8 → 4.0.2
• Test SDK: 17.1.0 → 18.0.1
• Blazored.LocalStorage: 4.3.0 → 4.5.0
• Swashbuckle: 6.4.0 → 10.1.0
• coverlet.collector: 3.1.2 → 6.0.4

Breaking Changes Fixed

MSTest v4 API change:

// Before (v2)
Assert.ThrowsException<KeyNotFoundException>(() => engine.ProcessAction(game, action));

// After (v4)
Assert.Throws<KeyNotFoundException>(() => engine.ProcessAction(game, action));

MSTest v4 constructor requirement: Removed DI constructor parameter from GameLookupTest (test classes must be parameterless or accept only TestContext).

CI/CD

Updated GitHub Actions workflow to use .NET 10.x SDK.

Original prompt

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This section details on the original issue you should resolve

<issue_title>Upgrade tooling</issue_title>
<issue_description>As a developer of the Homestead game I would like to update the application to use the latest tools, nuget packages and frameworks.
So that I can support the application and add new features.

Acceptance Criteria:

• The application has the latest versions of nuget packages and .NET frameworks
• The application builds successfully without errors
• All automated tests pass successfully
• The application runs

Use the following incremental migration guides as reference when updating ASP.NET

• Migrate from .Net 6 to 7
• Migrate from .Net 7 to 8
• Migrate from .Net 8 to 9
• Migrate from .Net 9 to 10</issue_description>

<agent_instructions>You are an expert in ASP.NET migrations. We need to update this application to the latest versions. Analyze the code base first and come up with a plan using the issue description. Ensure all the defined acceptance criteria is met.</agent_instructions>

Comments on the Issue (you are @copilot in this section)

• Fixes Upgrade tooling #25

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