improve conversation saving and reloading

[julio75012]

loading - use llm for searching something:
input: an indication by the user of what the user wants to recover, the conversation history and a date range. output: a ranking of the most probable

saving - add a field at every message to make a maximum ten words. preferably 5 words. use only key words that are very significtive

offer a command to name the conversation when using bye (or even using the llm to name it but this needs to wait)

[julio75012]

In case reloading a conv where the user question is at last, ask if the user can resend the same last message, edit it or send a new one from scratch