fix AI-417
#### PR Dependency Tree
* **PR #13492** 👈
This tree was auto-generated by
[Charcoal](https://github.com/danerwilliams/charcoal)
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## Summary by CodeRabbit
* **New Features**
* Copying code snippets now uses a rich format for improved paste
fidelity in compatible editors.
* Preserves code block formatting and language when pasted, reducing
manual cleanup.
* Continues to support plain text and HTML paste for broad
compatibility.
* Works more reliably when moving content within the app.
* Existing copy confirmation remains unchanged.
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