Enhancement: Character card chat improvements

[rmusser01]

Improvements for all character card-related chats:

• [ ] Restore the 'Download Chat history as JSON' button
• [ ] Add a 'Continue' button for the current speaking character to continue from their last message
• [ ] 'Generate a response as me' button - When clicked will take the chat history and use that to generate the next response for the user.
• [ ] 'Search Saved Chats' - There is an option to save chats, but no option to load them. There should be the option to load a chat from the DB or from a JSON file.
• [ ] Fix the 'Save chat to DB' option

[rmusser01]

I want to re-architect this portion, so instead: Character Card chats are saved to their own sqlite DB, and then that would simplify RAG/handling of them, keeping them separate from everything else, and not allowing cross-contamination.

Should be an option to migrate a chat entry to the Media DB as a media item. So, new features:

1. Re-architect character chats to save chats to a new, Character chat DB, by default
2. Allow the user to migrate a chat item from the Chat DB to the Media DB
3. Allow the user to not-save chats by default to the chat DB.
4. Allow the user to not-save chats to the chat DB for the current chat
5. Provide the option to users to save a previously untracked chat into the DB as a new chat item. This will save the chat as a point-in-time snapshot, and not continously update it.
6. Following that, allow the user to update the previously saved chat and update it with the latest messages.

[rmusser01]

I want to re-architect this portion, so instead: Character Card chats are saved to their own sqlite DB, and then that would simplify RAG/handling of them, keeping them separate from everything else, and not allowing cross-contamination.

Should be an option to migrate a chat entry to the Media DB as a media item. So, new features:

1. Re-architect character chats to save chats to a new, Character chat DB, by default
2. Allow the user to migrate a chat item from the Chat DB to the Media DB
3. Allow the user to not-save chats by default to the chat DB.
4. Allow the user to not-save chats to the chat DB for the current chat
5. Provide the option to users to save a previously untracked chat into the DB as a new chat item. This will save the chat as a point-in-time snapshot, and not continously update it.
6. Following that, allow the user to update the previously saved chat and update it with the latest messages.