Update Spinner.features.stories.tsx to no longer use styled-components

[llastflowers]

Closes https://github.com/github/primer/issues/5637

Changelog

New

Added new CSS module

Changed

Changed Spinner.features.stories.tsx to no longer use styled-components

Removed

Removed anything associated with styled-components

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)

[github-actions]

size-limit report 📦

Path	Size
packages/react/dist/browser.esm.js	90.28 KB (0%)
packages/react/dist/browser.umd.js	90.44 KB (0%)

[Copilot]

Pull Request Overview

This PR removes styled-components usage from the Spinner component's feature stories by replacing the Box component with a CSS module approach. The change aligns with the project's migration away from styled-components while maintaining the same visual layout and functionality.

• Replaced Box component with a div element using CSS module classes
• Created a new CSS module file to define the styling previously handled by the sx prop
• Removed the Box import that is no longer needed

Reviewed Changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated 1 comment.

File	Description
packages/react/src/Spinner/Spinner.features.stories.tsx	Replaced Box component with div and CSS module class, removed Box import
packages/react/src/Spinner/Spinner.features.stories.module.css	Added new CSS module with flexbox styling equivalent to the previous sx prop