fix AI-313, BS-3611
#### PR Dependency Tree
* **PR #13096** 👈
This tree was auto-generated by
[Charcoal](https://github.com/danerwilliams/charcoal)
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## Summary by CodeRabbit
* **Refactor**
* Improved performance and resource management in code block
highlighting by using a shared highlighter instance across all code
blocks.
* Enhanced the text rendering component with additional reactive
capabilities.
* **Style**
* Updated the comment sidebar header with a new background color for
improved visual consistency.
<!-- end of auto-generated comment: release notes by coderabbit.ai -->
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