New feature: Play all variations in interactive lesson

[Oliveinparis]

I like the interactive lesson feature, but people always put variations in the same chapter making them only accessible by analysis, which is not the same as interactive lessons. So:

I would like a checkbox, that when checked the interactive lesson would loop through all the variations and main line in the chapter. This is added in "lichess tools, by Siderite", but it's only for lichess.