Delay on CSS transitions causes glitches

[Rich-Harris]

The CSS needs to be applied immediately (in shared/transitions.js) if there's a delay:

-if ( intro && obj.tick ) obj.tick( 0 );
+if ( intro ) {
+  if ( obj.tick ) obj.tick( 0 );
+  if ( obj.css ) node.style.cssText += ` ${obj.css( 0 )}`;
+}

Would also need to remove the styles once the transition starts.