The Showcase returns with example apps

What changed

• The Showcase is back with a gallery of example apps, and you can open it from the Builder and the site footer. Apps that save data in the browser now run there the same way they do in the Builder.
• Builder version history names each version after the prompt that made it. A stopped reply says Stopped and shows the credits it used.
• The Builder Console lists errors as rows and shows a syntax error once. Reopening a project shows the newest chat message, and sign-up now requires you to accept the Terms.