[frontend] save user chat history

[anfibiacreativa]

Please provide us with the following information:

This issue is for a: (mark with an x)

- [ ] bug report -> please search issues before submitting
- [x ] feature request
- [ ] documentation issue or request
- [ ] regression (a behavior that used to work and stopped in a new release)

Expected/desired behavior

The chat history is saved to the local client and accessible to the end-user via an expansible blade in the UI.

If the end-user clicks on a question they already clicked, from the default questions, roundtrips are prevented and responses are loaded from the local storage.