fix(useTourEngine): start tour when run is true and steps load after mount

[ArmaanjeetSandhu]

Addresses #1211

The fix matches the mount effect, i.e., when run && size && status === idle, start the tour if the steps validate.

• The else branch keeps the prior idle → ready behavior for invalid steps, so the only behavioral change is that valid steps now start.
• Every added dep is a stable reference or a primitive, and the status === IDLE guard makes any extra fire a no-op, so there's no re-render churn and no double-start with usePropSync (both the "run already true" and "run toggled" paths start exactly once).

One new regression test for this has been added in test/hooks/useTourEngine.spec.ts. The full suite passes, and there are no API changes.

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[Copilot]

Pull request overview

Fixes a regression in useTourEngine where tours wouldn’t start if run is true from the initial render but steps are populated asynchronously after mount (issue #1211). The updated update-effect now mirrors the mount behavior by starting the tour when run && size && status === IDLE and the provided steps validate.

Changes:

• Update useTourEngine’s useUpdateEffect to call controls.start(...) (instead of only transitioning to READY) when valid steps arrive after mount while run is already true.
• Expand the useUpdateEffect dependency list to include the referenced props/values used inside the effect.
• Add a regression test covering “run already true + steps arrive after mount” and asserting the tour enters RUNNING and emits TOUR_START.

Reviewed changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated no comments.

File	Description
src/hooks/useTourEngine.ts	Starts the tour (not just sets READY) when valid steps arrive after mount and run is already true.
test/hooks/useTourEngine.spec.ts	Adds a regression test reproducing #1211 and asserting the tour starts when async steps arrive.

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