[Feature] add a "favorites" or "bookmarking" functionality to the chat history

Is your feature request related to a problem? Please describe.
I'm always frustrated when I try to find meaningful conversations in my chat history. Currently, there is no way to mark certain conversations or messages as important, which makes it challenging to navigate through past chats and locate the ones that are significant to me.

Describe the solution you'd like
I would like a feature that allows users to 'favorite' or 'bookmark' specific messages or conversations within the chat history. This feature should be easily accessible, perhaps with a star icon or a bookmark symbol next to each message. Once marked as a favorite, these messages should be quickly retrievable through a dedicated section or filter.

Describe alternatives you've considered
An alternative solution could be to allow users to tag messages with custom labels and then filter the chat history based on these tags. However, this might be more complex to implement and use. A simple 'favorite' feature seems to be a more user-friendly solution.

Additional context
This feature would be particularly useful for users who utilize the chat for work-related conversations. Being able to bookmark important messages would help in organizing the chat history and improving productivity. If possible, syncing these bookmarks across devices would be an added advantage, ensuring that a user can access their important messages no matter which device they are on.