Fix: Bug creating a 2nd window after closing all others fails

[AnnaSasDev]

Summary

Type of Change

• Bug fix (non-breaking change fixing an issue)
• New feature (non-breaking change adding functionality)
• Breaking change (fix or feature impacting existing APIs)
• Refactor / Code cleanup (no functional change)
• Documentation update
• Test addition or update
• Other (please describe):

Affected Modules / Scope

• InfiniFrame
• InfiniFrame.Blazor
• InfiniFrame.BlazorWebView
• InfiniFrame.Js
• InfiniFrame.Native
• InfiniFrame.Shared
• InfiniFrame.WebServer
• InfiniFrame.Tools.Pack
• InfiniFrameExample
• InfiniFrameTests
• Other:

Changes Introduced

Related Issues

Closes #290

Checklist

• My code follows InfiniFrame's coding conventions
• I added comments for complex or non-obvious code
• Documentation updated (if applicable)
• All tests pass locally
• Added new tests for any new functionality
• Existing tests pass
• No new warnings or errors introduced
• PR only includes changes relevant to the issue / feature

📖 Additional Context