fix(ci): trigger build when root-level NuGet/SDK config files change

[Copilot]

Dependabot NuGet bump PRs (e.g. changes to Directory.Packages.props) never triggered the build because the sound-switch path filter only matched SoundSwitch*/**, missing all root-level build config files.

Changes

• .github/workflows/dotnet.yml: extend the sound-switch paths filter to include root-level files that affect the build:
  • Directory.Packages.props — NuGet Central Package Management (where Dependabot bumps versions)
  • global.json — .NET SDK version pin
  • nuget.config — NuGet feed config

sound-switch:
  - 'SoundSwitch*/**'
  - 'Directory.Packages.props'
  - 'global.json'
  - 'nuget.config'

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[Copilot]

Pull request overview

Updates the GitHub Actions path filtering so the .NET build workflow triggers for pull requests that modify repository-level .NET/NuGet configuration files (commonly touched by Dependabot), aligning CI behavior with how the .NET solution is actually impacted.

Changes:

• Extend the sound-switch path filter to include Directory.Packages.props, global.json, and nuget.config.