🎨 updated middleware dart package

[Archish27]

Description

Brief description of changes made in this PR.

Type of Change

Please delete options that are not relevant.

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)
• Documentation update
• Performance improvement
• Code refactoring
• Test improvements
• Build/CI improvements

Testing

• Unit tests pass (flutter test)
• Integration tests pass (if applicable)
• Manual testing performed
• Tested on multiple platforms:
  • Android
  • iOS
  • Web
  • Desktop (if applicable)

Breaking Changes

If this PR contains breaking changes, please describe them here and update the migration guide.

Checklist

• My code follows the style guidelines of this project
• I have performed a self-review of my code
• I have commented my code, particularly in hard-to-understand areas
• I have made corresponding changes to the documentation
• My changes generate no new warnings
• I have added tests that prove my fix is effective or that my feature works
• New and existing unit tests pass locally with my changes
• Any dependent changes have been merged and published in downstream modules
• I have updated the CHANGELOG.md (if applicable)

OpenTelemetry Compliance

• Changes follow OpenTelemetry specification
• Semantic conventions are properly implemented
• No deviations from OpenTelemetry standards (or properly documented)

Flutter-Specific Considerations

• Widget integration works correctly
• App lifecycle handling is appropriate
• Navigation integration functions properly
• Platform-specific code is properly isolated
• Performance impact is minimal

Screenshots/Videos

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Additional Notes

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Related Issues

Closes #(issue number)