fix#15080fix#15085fix#15031fix#15094
#### PR Dependency Tree
* **PR #15098** 👈
This tree was auto-generated by
[Charcoal](https://github.com/danerwilliams/charcoal)
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## Summary by CodeRabbit
* **Bug Fixes**
* Improved code-block paste behavior for plain-text insertion
* Fixed block selection ordering to reflect document model
* Made table cell formatting resilient to conversion errors
* Ensured user feature list is consistently returned as an array
* **Refactor**
* Streamlined authentication session fetch and profile enrichment flow
* **Tests**
* Added tests for markdown blockquote list preservation
* Added authentication session validation tests
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