Fix memory leak with the <EasterEggUsername/>

When you log out while the `<EasterEggUsername/>` is active, there is a memory leak because the colors are trying to toggle while the component is unmounted.

Doing this will probably involve using the `useIsFocused()` hook and wrapping the `setState()` calls w/ `if (isFocused) {...}`. That will require this component to be refactored into a modular component.