<!-- This is an auto-generated comment: release notes by coderabbit.ai
-->
## Summary by CodeRabbit
* **New Features**
* Introduced a dedicated AI chat panel title bar with dynamic embedding
progress display and an optional playground button.
* Added a modal playground interface accessible from the chat panel
title when enabled.
* **Refactor**
* Moved the chat panel title and related UI logic into a new, reusable
component for improved modularity.
* Simplified the chat content area by removing the internal chat title
rendering and related methods.
<!-- end of auto-generated comment: release notes by coderabbit.ai -->
b85afa7394