Fixed clicking fav button propagating

src/components/FavoriteButton.tsx

@@ -18,6 +18,7 @@ class FavoriteButton extends React.Component<FavoriteButtonProps, FavoriteButton
 
     handleClick = (event: React.MouseEvent) => {
         event.stopPropagation(); // Stops the card from being selected in the sidebar.
+        event.preventDefault(); // Also stops the card from being selected in the sidebar.
         
         const newState = !this.state.isFavorite;