chore: Schema tests

[matthewlipski]

Summary

This PR adds tests to ensure that the editor schema looks as it should.

Rationale

These tests are a follow up to #2046, which fixed missing fields in schema.blockSpecs but didn't include tests.

Changes

Added schema test folder and file.

Impact

N/A

Testing

See above.

Screenshots/Video

N/A

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	Preview	Updated (UTC)
blocknote	Ready	Preview	Oct 8, 2025 8:57am
blocknote-website	Ready	Preview	Oct 8, 2025 8:57am

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commit: 923b263