Improvements and fixes

Improved

• Buttons that only show an icon now explain themselves when you hover over them.
• The back button takes you to the page you actually came from.
• An app that's resting now says it's sleeping rather than stopped, and its starting page shows real progress while it wakes up.
• Large data tables load as you scroll, so big ones open quickly.
• Upgrading an app shows a preview of what will change before anything does.

Fixed

• A workflow that an app still depends on can no longer be deleted by mistake.