Add the ability to undo destructive actions

[nathandyer]

Description

For actions that are permanent/destructive, consider adding the ability to "undo" an action for a short period of time after clicking the button (~30 seconds). Although our UI guides users to making sure they are positive about the change they are making, sometimes a mistake isn't realized until after the button is pushed.

How will this impact SecureDrop users?

This will make doing certain actions (removing source accounts, etc.) less stressful.

How would this affect SecureDrop's threat model?

This shouldn't really change any security properties of the system, so should not have an effect on the threat model.

User Stories

As a journalist, I want to be able to undo an action, so that I don't have to worry about losing something important if I made a quick mistake.