0.23.0-beta.17

refactor(core): extract ai-chat-panel-title component (#13209)

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## 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.

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