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fix(data-visualizer): show None as None, not null (#512)

* fix(data-visualizer): show None as None, not null

Send Python's None as an "empty" node with displayValue "None", so the
data visualizer shows draw_data(None) as None. Needs
@sourceacademy/common-data-visualizer 0.0.2 (source-academy/plugins#123).

Refs source-academy/plugins#115

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

* style: format data-visualizer tests

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

* chore(deps): bump @sourceacademy/common-data-visualizer to ^0.0.2

0.0.2 adds displayValue to the "empty" node, which noneNode() uses.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

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

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