feat: Migrate E2E tests to Vitest Browser Mode

[matthewlipski]

Summary

Rationale

Changes

Impact

Testing

Screenshots/Video

Checklist

• Code follows the project's coding standards.
• Unit tests covering the new feature have been added.
• All existing tests pass.
• The documentation has been updated to reflect the new feature

Additional Notes

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Project	Deployment	Actions	Updated (UTC)
blocknote	Error		May 29, 2026 4:33pm
blocknote-website	Error		May 29, 2026 4:33pm

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✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch vitest-browser

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commit: e128efb