AI Builder improvements now available to all users

The AI Builder now features a refined form that combines simplified prompt templates with free-text input, making it easier to describe your ideas. You can use the new "Improve description" feature to enhance your own written descriptions. The AI preview flow has been reworked to show clearer next steps when results need adjustment, and the idea editing and regeneration flow is now more visible and intuitive. The template selection flow has also been updated to use the new AI form experience for a more consistent starting point.