Release v1.8.4
Fix MSIX package creation error with null file check
- Add existence validation for generated MSIX file before renaming
- Include comprehensive debugging output for MSIX creation troubleshooting
- Resolve 'type Null is not a subtype of type FutureOr' error
- Enhance error handling in Windows MSIX build workflow
- Improve workflow reliability with proper null checks
Fixes MSIX package generation failure in GitHub Actions workflow.