* feat: add functionality to insert messages at a specific index in the Redux store
- Introduced a new interface for inserting messages at a specified index.
- Implemented the insertMessageAtIndex reducer to handle message insertion.
- Updated saveMessageAndBlocksToDB to support message insertion logic.
- Modified appendAssistantResponseThunk to utilize the new insertion functionality.
* feat: integrate multi-select mode handling in MessageGroup component
- Added useChatContext hook to access multi-select mode state.
- Updated isGrouped logic to account for multi-select mode, ensuring proper message grouping behavior.
- Enhanced MessageWrapper styles for better layout management in different modes.
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Co-authored-by: kangfenmao <kangfenmao@qq.com>
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