Stops the user from accidentally double clicking the button or accidentally pressing the add hotkey twice. Button re-enable obv doesn't apply unless dupes/overwrite is allowed.

2.5s seems sane here to me but open to suggestions if this seems too much. If the user scans a word, adds it, scans another. Since the button is re-rendered, the second popup doesn't have any extra delay on adding.

Considered disabling then re-enabling after the card is created. But in some cases this could happen so fast that a user could still accidentally double click and end up adding two cards.