fix#14296fix#14289
#### PR Dependency Tree
* **PR #14315** 👈
This tree was auto-generated by
[Charcoal](https://github.com/danerwilliams/charcoal)
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## Summary by CodeRabbit
* **Bug Fixes**
* Improved inline editor stability for selection edge cases and
beforeinput handling, with better recovery and native-input protection.
* Fixed potential crashes when deleting with selections outside the
editor bounds, including Firefox-specific scenarios.
* **Tests**
* Added unit tests covering beforeinput behavior and added Firefox
end-to-end regression tests.
* **Chores**
* Reduced CI test parallelism to streamline pipeline.
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