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SF-in-Lean previews

Review PR source diffs and rendered previews. Unchanged variants link to main.

Preview targets

Target	Title	Status	Commit	Review
Main	Baseline	current	`main`	Browse
#418	Add cross-book chapter references	published	`b0626dd2`	Review
#427	Basics: grade all three blt tests	published	`7b0ca83b`	Review
#429	LF/Basics: unhide code block inside details block	ci-failed	`9cff0b21`	Review