Persona Creator: History

[enricoros]

Make sure the user will not lose formerly created personas. The tab layout introduced in #282 would allow for a 'history' tab with the saved entries.

Requirements:

• for now, only consider the System prompts created at the end of a Youtube or Text processing
• have a persisted store with methods to add, list
• store the prompts in a 'v1' data structure (knowing personas sooner or later will happen Personas: Add custom, dynamic, and persisted #35 )
• bonus, clear, clear confirmation, reorder
• bonus: title the persona, somehow (easy from youtube, but how to do it from text?)
• bonus: generate a small image using the cheapest possible engine?

Now that we can create personas from text (#282) and before the improvements in (#199), we should save the prompts so that we don't repeat work.