fix: update Select to correctly merge classes

[joshblack]

Closes #6067

Changelog

New

Changed

• Update Select to correctly merge classes when className is provided

Removed

Rollout strategy

• Patch release

[changeset-bot]

🦋 Changeset detected

Latest commit: 186d6e0

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!

[Copilot]

Pull Request Overview

This patch ensures that consumer-provided className values are merged with the component’s internal classes instead of being overwritten.

• Destructure className from props and merge it with classes.Select (and classes.Disabled when applicable) via clsx.
• Move the {...rest} spread above the className prop so that incoming props don’t override the merged classes.
• Add a changeset for a patch release.

Reviewed Changes

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

File	Description
packages/react/src/Select/Select.tsx	Destructure className, adjust prop spread order, and merge classes via clsx
.changeset/quiet-sides-slide.md	Add patch-level changeset documenting updated class merging behavior

Comments suppressed due to low confidence (1)

packages/react/src/Select/Select.tsx:68

• Add tests for rendering the Select component with a custom className to ensure classes are merged correctly when className is provided.

className={clsx(className, classes.Select, disabled && classes.Disabled)}

[github-actions]

size-limit report 📦

Path	Size
packages/react/dist/browser.esm.js	94.47 KB (+0.14% 🔺)
packages/react/dist/browser.umd.js	94.54 KB (+0.05% 🔺)

[primer-integration]

👋 Hi from github/github! Your integration PR is ready: https://github.com/github/github/pull/380522

[primer-integration]

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