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Updates how we display Notebooks in Assistant to be more in line with
our AssistantQueryCell.
## To test:
- Open Assistant and ask it to create a test notebook and note the new
styling
<!-- This is an auto-generated comment: release notes by coderabbit.ai
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## Summary by CodeRabbit
* **New Features**
* Added unified, read-only notebook previews for create and update
proposals.
* Preview cells now support expandable content, clearer type icons,
metadata, and “Show more” controls.
* Added before-and-after metadata comparisons for replaced cells.
* Integrated previews into confirmation cards with approval, skip, and
refresh actions.
* Added skip-only confirmation flows when approval is unavailable.
* **Bug Fixes**
* Improved handling of parse failures, stale notebooks, invalid changes,
and loading errors.
* **Style**
* Refined confirmation card layouts, borders, spacing, and footer
presentation.
<!-- end of auto-generated comment: release notes by coderabbit.ai -->
Saxon Fletcher
81bccd6862