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e-stepper: the double arrows jump between breakpoints (#158)

* feat(e-stepper): show the step controls only once there is a run

Before a run the slider and the step buttons had nothing to act on: a lone
disabled handle and label, and disabled buttons.

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

* fix(e-stepper): the step slider counts from 0 and labels its last value

Blueprint labelled every s-th value from the first, so with 174 steps the right
end read 163. The slider now runs from 0 (the start) to the number of steps,
and always labels both ends.

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

* feat(e-stepper): the double arrows jump between breakpoints

The double arrows and the a / e keys go to the previous / next breakpoint()
statement, or to the first / last step when there is none, as in the stepper.
Needs the engine to mark them (py-slang#527).

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

* fix(e-stepper): a run of one step gives the slider a valid range

Blueprint's Slider needs max > min; with one state it was 0..0. The slider is
now 0..1 and disabled then.

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

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

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