fix(Button): Add min-width to small size button

[francinelucca]

Closes https://github.com/github/primer/issues/3422

Ports over the fix made in view components for inaccessible target size.

When a button size is small and it's content is too small (for example, a single character), the button may fall below target size standards for accessibility due to not having a minimum width set. This PR enforces a minimum width of 28px on small buttons.

Before:

After:

Changelog

Changed

• Added min-width to small button size styles in packages/react/src/Button/ButtonBase.module.css and packages/react/src/Button/styles.ts

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

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: 0074573

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]

Uh oh! @francinelucca, the image you shared is missing helpful alt text. Check your pull request body.

Alt text is an invisible description that helps screen readers describe images to blind or low-vision users. If you are using markdown to display images, add your alt text inside the brackets of the markdown image.

Learn more about alt text at Basic writing and formatting syntax: images on GitHub Docs.

🤖 Beep boop! This comment was added automatically by github/accessibility-alt-text-bot.

[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	97 KB (-0.02% 🔽)
packages/react/dist/browser.umd.js	97.4 KB (+0.01% 🔺)

[francinelucca]

No longer needed, see https://github.com/github/primer/issues/3422#issuecomment-2420677912