bugfix(Stack): Fix typo in custom media variable used in Stack component

[jonrohan]

This fixes an issue brought up https://github.slack.com/archives/C01L618AEP9/p1733943072984009

The variable I was using for the custom media was a typo and wasn't compiling into the actual value.

Changelog

New

Changed

Fix typo in custom media variable used in Stack component

Removed

Rollout strategy

• Patch release
• Minor release
• Major release; if selected, include a written rollout or migration plan
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Testing & Reviewing

Merge checklist

• Added/updated tests
• Added/updated documentation
• Added/updated previews (Storybook)
• Changes are SSR compatible
• Tested in Chrome
• Tested in Firefox
• Tested in Safari
• Tested in Edge
• (GitHub staff only) Integration tests pass at github/github (Learn more about how to run integration tests)

[changeset-bot]

🦋 Changeset detected

Latest commit: fd1cdc8

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

This PR includes changesets to release 1 package

Name	Type
@primer/react	Patch

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[github-actions]

👋 Hi, this pull request contains changes to the source code that github/github depends on. If you are GitHub staff, we recommend testing these changes with github/github using the integration workflow. Thanks!

[github-actions]

size-limit report 📦

Path	Size
packages/react/dist/browser.esm.js	103.45 KB (0%)
packages/react/dist/browser.umd.js	103.88 KB (0%)