Chat history management

[calderonsamuel]

Related issue

• Closes [FR]: Set save chat conversation option in settings #202

Description of changes

• Conversation titles are built using the first user prompt for the conversation
• Every received message updates the chat history saved in disk. There is no option to opt out of this, but users can easily delete their conversations (setting the option was too difficult for the backend).

For contributors

• I have added the relevant changes to the NEWS.md file
• I have added relevant tests or documentation with my changes

For reviewers

• [] Changes meet the acceptance criteria of the related issue
• [] The contribution follows style conventions and code of conduct
• [] Branch passes automated testing
• [] I have incremented the package version in the DESCRIPTION file before merging

[JamesHWade]

Nice work!

This is making me want to incorporate some sort of performance benchmarks. I doubt it's true in this case, but it would be nice to know if we're degrading performance of the app when we incorporate new features.

[calderonsamuel]

This would totally decrease performance once the chat history is big enough. Might be worth it to use an internal sqlite db?

The sidebar UI will also get clutered with a high number of chats. We should have a "See more" functionality for saved chats.