Clean Up View Transition Names

Remove view-transition-name after transition completes.

Incorrect (stale name):

sourceImg.style.viewTransitionName = "card";
document.startViewTransition(() => {
  targetImg.style.viewTransitionName = "card";
});

Correct (name cleaned up):

sourceImg.style.viewTransitionName = "card";
document.startViewTransition(() => {
  sourceImg.style.viewTransitionName = "";
  targetImg.style.viewTransitionName = "card";
});