Refactor <Steps> counter

[HiDeoo]

Description

• Closes <Steps> Numbers out of order #2032

A new attempt at fixing <Steps> counter using a custom counter.

This PR is a draft as I just wanted a preview URL to share. If the approach is working and accepted, tests would need to be updated and a changeset to be added.

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🦋 Changeset detected

Latest commit: d3f5d4d

The changes in this PR will be included in the next version bump.

This PR includes changesets to release 1 package

Name	Type
@astrojs/starlight	Patch

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Name	Status	Preview	Updated (UTC)
starlight	✅ Ready (Inspect)	Visit Preview	Jun 20, 2024 6:05pm

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[delucis]

I think this looks good!

Tested in Chrome 126, Safari, and Firefox on macOS without issues. Maybe worth testing on Windows if someone is able? I think we had issues with Windows on the previous fix.

[lorenzolewis]

Tested on Safari on iOS 17.5.1 (21F90) and LGTM!

[liruifengv]

Tested in Chrome, Edge and Firefox on Windows11, works perfect!

[delucis]

Thanks for testing @lorenzolewis and @liruifengv! I know @HiDeoo may have less time to work on this and I feel like the bug is relatively urgent, so will take over this PR now and polish it up for release.

[delucis]

Thanks again for figuring out this fix @HiDeoo!