CodeRabbit Generated Unit Tests: Add unit tests for PR changes

[coderabbitai]

Unit test generation was requested by @blazingvx.

• Theme Changes #5 (comment)

The following files were modified:

• IconMapper.Tests/App.config
• IconMapper.Tests/ContextMenuOptionsTests.cs
• IconMapper.Tests/IconMapper.Tests.csproj
• IconMapper.Tests/MainFormThemeTests.cs
• IconMapper.Tests/UpdateConfigTests.cs
• IconMapper.Tests/packages.config
• IconMapper.sln

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