v0.1.1

What's changed

• Step transitions no longer wait for animations inside popup content, so button, icon, spinner, and other nested transitions do not delay coachmark repositioning.
• Direct motion on the backdrop, positioner, popup, and viewport transition wrappers remains coordinated.
• Added a viewport-only transition mode to the playground for isolating and testing content motion.
• Added the official documentation and design write-up to the README.

Full changelog: v0.1.0...v0.1.1