fix: update regex for checklist items #2288

[nperez0111]

Summary

Just needed to set the regex to match only the start of the string, rather than anywhere in the middle of a string

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

Closes #2288

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Project	Deployment	Review	Updated (UTC)
blocknote	Ready	Preview	Dec 16, 2025 10:53pm
blocknote-website	Ready	Preview	Dec 16, 2025 10:53pm

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