Edit a stage template straight from the route editor

A stage on the route whiteboard now carries a pencil, and the Edit stage drawer an Edit stage template button. Either one opens the stage itself, with its name, description, capacity and cost code, without leaving the route. Because a stage is a template, the change reaches every route built on it, so the button first shows how many routes that is, and the stage nodes in all of them pick up the new name right away. Orders already out on the floor keep the names they were created with.

If you open a stage before choosing which one it is, the drawer now offers the same picker, so you can choose or create the stage right there instead of finding a bare "New stage" with nothing to do.

Before this, the name on a stage could only be changed by leaving the route, finding the stage under Rules Engine → Stages, and editing it there. A rename made there never reached the routes using the stage.