Y ProseMirror integration

[nperez0111]

• fix: setup for yjs 14
• chore: rm initialContent hack
• chore: fixup tests

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	Ready	Preview	May 13, 2026 4:14pm
blocknote-website	Error		May 13, 2026 4:14pm

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commit: ac52371