fix: Toggle and check list item blocks

[matthewlipski]

Summary

This PR fixes a variety of issues with the toggle list item block, as well as fixing styling for check list item blocks.

Closes #2067

Rationale

These two blocks are currently not working as intended. The check list item block is mostly ok and just needs styles tweaked. The toggle list item block has a bunch of issues though, regarding rendering, exporting, etc.

Changes

• Adjusted check list item render and styles.
• Fixed toggle list item blocks not showing the toggle button.
• Fixed toggle list items not being exported to external HTML in the proper list structure.
• Fixed serializeBlock passing undefined children in Block to render.

Impact

The check list and toggle list item blocks are part of the default blocks, so this fix is fairly critical.

Testing

• Added toggle list item blocks to unit tests which include all default blocks.
• Added e2e test to screenshot all basic blocks, to prevent styling regressions.

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	Preview	Updated (UTC)
blocknote	Ready	Preview	Oct 7, 2025 5:37pm
blocknote-website	Ready	Preview	Oct 7, 2025 5:37pm

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commit: c8b5812