UI: Add proper focus outline to Button

[Sidnioulz]

What I did

Added a thicker, WCAG compliant focus outline to Button which we seem to have missed :)

LMK what you think!

Before

After

Checklist for Contributors

Testing

The changes in this PR are covered in the following automated tests:

• stories

Manual testing

http://localhost:6006/?path=/story/button-component--pseudo-states&globals=sb_theme:side-by-side

Documentation

N/A

Checklist for Maintainers

• When this PR is ready for testing, make sure to add ci:normal, ci:merged or ci:daily GH label to it to run a specific set of sandboxes. The particular set of sandboxes can be found in code/lib/cli-storybook/src/sandbox-templates.ts

• Make sure this PR contains one of the labels below:

  Available labels

  • bug: Internal changes that fixes incorrect behavior.
  • maintenance: User-facing maintenance tasks.
  • dependencies: Upgrading (sometimes downgrading) dependencies.
  • build: Internal-facing build tooling & test updates. Will not show up in release changelog.
  • cleanup: Minor cleanup style change. Will not show up in release changelog.
  • documentation: Documentation only changes. Will not show up in release changelog.
  • feature request: Introducing a new feature.
  • BREAKING CHANGE: Changes that break compatibility in some way with current major version.
  • other: Changes that don't fit in the above categories.

🦋 Canary release

This PR does not have a canary release associated. You can request a canary release of this pull request by mentioning the @storybookjs/core team here.

core team members can create a canary release here or locally with gh workflow run --repo storybookjs/storybook canary-release-pr.yml --field pr=<PR_NUMBER>

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✨ Finishing touches

🧪 Generate unit tests

• Create PR with unit tests
• Post copyable unit tests in a comment
• Commit unit tests in branch sidnioulz/fix-button-focus

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View your CI Pipeline Execution ↗ for commit edc0177

Command	Status	Duration	Result
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☁️ Nx Cloud last updated this comment at 2025-09-21 15:35:55 UTC

[MichaelArestad]

Nice! Thanks!