Fix boolean field editing in nested structures

[adrianlyjak]

Correctly interpret anyOf: [boolean, null] in JSON Schema to render boolean fields as checkboxes in the UI.

The previous schema reconciliation logic failed to extract the underlying primitive type when anyOf was used with null, causing boolean fields in nested structures to be treated as strings and rendered with a text input instead of a boolean selector.

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Linear Issue: LI-3766

 

[cursor]

Cursor Agent can help with this pull request. Just @cursor in comments and I'll start working on changes in this branch.
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