Save the log of operations

[micz]

Sometimes, I accidentally click the wrong line and move an email to the wrong folder. Since the undo option is not available (#16), I have to manually search for the misplaced email.

In an add-on I developed, which moves sent emails based on specific rules, I save an array of recent actions in the session storage. This action log can be accessed through a tab, which is opened by a button on the options page. Using session storage ensures it will be cleared when Thunderbird is closed.

I understand that this feature might conflict with the "simplicity" principle you mentioned in some issues, but it would remain an "under the hood" feature, accessible only to those who are interested. Additionally, it might help address #16 by saving structured data and enabling an "undo" option that lets users reverse a move action directly from the log.