Do not obstruct "Vault" button with "Password copied" popup

Currently when generating a password and using the copy function, a popup comes up in the bottom of the extension window. This obstructs the “Vault” button for example, so switching to the vault to use the freshly copied password is frustrating.

One has to wait for the popup to disappear first, or double-click in the “Vault” area to dismiss the popup and then navigate to “Vault”.

This is kind of a tough one, as the toasts are not OS native (thus the tap to dismiss) - but we are working on some app improvements with Xamarin.