chore: Bump NextJS & React versions

[matthewlipski]

Summary

This PR bumps the React and NextJS versions, as the versions we were previously using (19.2.0 and 15.5.1 respectively) are affected by a vulnerability detailed here.

Rationale

N/A

Changes

N/A

Impact

N/A

Testing

N/A

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	Dec 5, 2025 3:58pm
blocknote-agent-demo	Error		Dec 5, 2025 3:58pm
blocknote-website	Ready	Preview	Dec 5, 2025 3:58pm

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commit: b9856f6

[YousefED]

looks good, but double check the changes in the .gen file