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CSE machine: Python's None in a list box is drawn as a slash (#4430)

A snapshot's None is an object (#4111), so that a frame binding shows it as
"None" and not JS null's "null"; but in a box of a box-and-pointer diagram
it was also drawn as the text "None". There it is now drawn as JS null is,
with the diagonal slash of the empty list; frame bindings keep "None".

Co-authored-by: Claude Opus 5.5 <noreply@anthropic.com>

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