Edit: Persist a users prompt until submitted or deleted

[umpox]

What:

• The Edit input can be hidden quite easily, this means a user could possibly lose their prompt that they have been writing.

How:

• Once the input is dirty, save the prompt to local storage until it is either: removed from the input, or submitted.
• This way, users are still able to access a partially written prompt even if they close the Edit input.
• We should ensure that we properly save the prompt, including any contextItems in local storage. We can enrich the Edit input with these values using the initialValues object.