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CSE machine / e-stepper: show a function's local and global names on hover (#4536)

* CSE machine: show a function's local and global names on hover

When the evaluator sends them (py-slang's closure `metadata.locals` and
`metadata.globals`), the function tooltip lists them between the
parameters and the body: `locals: (y, h)` and `globals: (g)`. Functions
without them (js-slang's, or from an older py-slang) are unchanged.

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

* CSE machine: list local and global names without parentheses

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

* CSE machine: give each line of local or global names room in the description

Without it, the two lines pushed the body out of the truncated
description that a hovered function shows (and that is printed).

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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