User request: a way to change the type of all the chapters in the study

[Siderite]

Right now, for a large study, if you want to change the chapters to Interactive or back to Normal you have to do it chapter by chapter. There was a request for a way to do it in bulk, for the whole study.

I know there are plans to create a more flexible study API that would enable such a feature, but I think it would be a good native Lichess feature, as well.