* fix(schema): preserve user-defined JSON schema for Python list[dict]
Fixes issue where JSON schema properties manually defined in the UI are
lost when saving Python scripts with list[dict] or untyped array parameters.
Changes:
- Preserve all items fields (properties, required, additionalProperties, etc.)
- Preserve items.type instead of hardcoding "object"
- Preserve type for untyped parameters using nullish coalescing
- Add type safety check for items preservation
The Python parser cannot infer object properties from list[dict] annotations.
This fix preserves user-defined schema fields when parser cannot infer structure.
Fixes#7209
* fix(schema): preserve all fields for untyped lists, not just properties
Address bot feedback for consistency. The untyped list branch now preserves
all user-defined fields (required, additionalProperties, enum, etc.) just
like the record[] branch, instead of only preserving properties.
This ensures users who define required fields or enum values for untyped
list parameters don't lose that data on save.
Related to #7209
* nits and publish
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Co-authored-by: Devdatta Talele <devtalele0@gmail.com>
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