add new line of CSS to separate underline from hover event

[llastflowers]

Closes https://github.com/github/primer/issues/5176

Separates underline from tab hover event to address hover area gap issue.

Loom: updated behavior

Changelog

New

Added a new line of CSS to separate the UnderlineNav underline from the hover area

Changed

Changed hover event on UnderlineNav component

Removed

N/A

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

This change can be seen by looking at UnderlineNav in Storybook preview

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: 1942738

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

Not sure what this means? Click here to learn what changesets are.

Click here if you're a maintainer who wants to add another changeset to this PR

[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	94.34 KB (0%)
packages/react/dist/browser.umd.js	94.5 KB (0%)

[primer-integration]

👋 Hi from github/github! Your integration PR is ready: https://github.com/github/github/pull/380074

[primer-integration]

🟢 golden-jobs completed with status success.

[Copilot]

Pull Request Overview

This PR addresses a hover gap issue in the UnderlineNav component by preventing pointer events on the underline, ensuring the hover area doesn’t include the underline element.

• Added pointer-events: none to the underline pseudo-element to separate it from the hover area.
• Included a changeset entry 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/internal/components/UnderlineTabbedInterface.module.css	Added pointer-events: none to the underline to fix hover gap issue
.changeset/clean-dolls-build.md	Added patch-level changeset with description of the CSS update

Comments suppressed due to low confidence (1)

packages/react/src/internal/components/UnderlineTabbedInterface.module.css:108

• Add or update a visual regression or Storybook snapshot test for UnderlineNav to verify the hover gap fix and prevent future regressions.

pointer-events: none;

[github-actions]

👋 Hi, there are new commits since the last successful integration test. We recommend running the integration workflow once more, unless you are sure the new changes do not affect github/github. Thanks!

[francinelucca]

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