We used react-reveal to add a bounce to the center domain button in TreeView (for #338), but that package was not maintained (#684), so we eventually removed it (part of #1352).

It would be nice to have some simple animations to improve UX, such as:

• Indicating the center domain button in TreeView
• Adding movement to the tractor image on the goal loading page

React Native has clean and easy-to-use animations, but has dependency conflicts without some of our React stack, so we're probably better off finding a different (and lighter-weight) alternative.