feat: add support for size to Blankslate

[joshblack]

Closes https://github.com/github/primer/issues/4863

Changelog

New

• Add support for size to Blankslate

Changed

• Update overall styling to align with intended usage in Figma

Removed

Rollout strategy

• Minor release

[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	94.42 KB (0%)
packages/react/dist/browser.umd.js	94.48 KB (0%)

[changeset-bot]

🦋 Changeset detected

Latest commit: 62bb259

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	Minor

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[lukasoppermann]

Hey @joshblack,

great. Some minor points:

1. Could you add a border to the stories with narrow and spacious, as this makes it easier to see the difference.
2. The small variant should use a small button variant as well.
3. Maybe we can make primary and secondary action togglable in the playground story?

[lukasoppermann]

Great changes, all that is left is to make sure that in the small variant, the actions use the small variant as well.

[joshblack]

Thanks @lukasoppermann! Made the following changes:

• Add border to stories with narrow and spacious
• Add support for small button action in small blankslate
• Add primaryAction and secondaryAction knob to playground to toggle primary/secondary actions