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## Summary by CodeRabbit
* **New Features**
* Introduced a new chat list view with improved grouping of messages by
date and support for rich markdown rendering, including math
expressions.
* Added support for displaying user message attachments and hints within
the chat interface.
* **Improvements**
* Enhanced chat cell designs for user, assistant, and system messages,
providing clearer layouts and better text rendering.
* Streamlined chat message streaming with incremental markdown updates
and improved scrolling behavior.
* Updated chat view models to include timestamps and refined message
typing.
* **Bug Fixes**
* Improved handling of streaming responses and error reporting with more
accurate timestamps.
* **Refactor**
* Replaced the legacy table-based chat UI with a modern list-based
implementation.
* Simplified and unified chat cell view models and cell rendering logic.
* **Chores**
* Updated and added several third-party dependencies to support new UI
components and markdown features.
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