fix(BaseStyles): set data-color-mode to auto when auto color mode

[joshblack]

Update our BaseStyles component to set data-color-mode to auto when the colorMode is set to auto. This helps us out on the primer-docs side when we are doing SSR so that the fallbacks of custom properties resolve to the correct theme.

Changelog

New

Changed

• Update our BaseStyles component to set data-color-mode to auto when the colorMode is set to auto

Removed

Rollout strategy

• Patch release
• Minor release
• Major release; if selected, include a written rollout or migration plan
• None; if selected, include a brief description as to why

[changeset-bot]

🦋 Changeset detected

Latest commit: 3a6859e

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	105.64 KB (+0.07% 🔺)
packages/react/dist/browser.umd.js	106.11 KB (+0.07% 🔺)

[primer-integration]

👋 Hi from github/github! Your integration PR is ready: https://github.com/github/github/pull/360763

[primer-integration]

🟢 golden-jobs completed with status success.

[github-actions]

👋 Hi, there are new commits since the last successful integration test. We recommend running the integration workflow once more, unless you are sure the new changes do not affect github/github. Thanks!