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`keyUp` is only invoked if the component's root element (or one of its descendants) has focus which isn't great for keyboard users because if they open a user card and want to close it, they have to tab through to the user card and only then will the Esc key actually close the card. This commit adds a `keyup` event listener on the `document` for the Esc key so that the user card is closed (if it's open) no matter where the focus is.