Remove link underline effect on hover for Link and Button variant link

[Copilot]

• Explore ButtonBase.module.css and Link.module.css to understand current structure
• Add &:hover { text-decoration: none; } under &[data-no-visuals] in ButtonBase.module.css
• Add &:hover { text-decoration: none; } under [data-a11y-link-underlines='true'] &:where([data-inline='true']) in Link.module.css
• Add changeset for the change
• Lint and format changed files
• Run build and tests to validate (all 2324 tests pass)
• Code review and security checks
• Create PR (Remove link underline effect on hover for Link and Button variant link #7676)
• Add update snapshots label (noted in PR description — requires maintainer to add)

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[changeset-bot]

🦋 Changeset detected

Latest commit: 2bb322c

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]

⚠️ Action required

👋 Hi, this pull request contains changes to the source code that github/github-ui depends on. If you are GitHub staff, test these changes with github/github-ui using the integration workflow. Check the integration testing docs for step-by-step instructions. Or, apply the integration-tests: skipped manually label to skip these checks.

[Copilot]

Pull request overview

This PR updates link-underlining behavior when the data-a11y-link-underlines="true" preference is enabled, and refreshes VRT snapshots to match.

Changes:

• Adjust Link (inline) underline styling under the a11y underline preference, including hover behavior.
• Adjust Button variant="link" underline styling under the a11y underline preference (notably the data-no-visuals case).
• Update Playwright visual snapshots and add a patch changeset.

Reviewed changes

Copilot reviewed 3 out of 21 changed files in this pull request and generated 2 comments.

File	Description
packages/react/src/Link/Link.module.css	Adds hover override under a11y underline preference for inline links
packages/react/src/Button/ButtonBase.module.css	Adds hover override under a11y underline preference for link-variant buttons with data-no-visuals
.playwright/snapshots/components/Link.test.ts-snapshots/*	Updates VRT baselines for link hover/focus states across themes/modes
.changeset/remove-link-underline-on-hover.md	Declares a patch release note for the styling change

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[HiroAgustin]

Validated on deployed storybook:

Screen.Recording.2026-03-18.at.14.45.57.mov

Screen.Recording.2026-03-18.at.14.46.15.mov

[primer-integration]

👋 Hi from github/github-ui! Your integration PR is ready: https://github.com/github/github-ui/pull/16539

[primer-integration]

Integration test results from github/github-ui:

  CI Passed
  VRT Passed
  Projects Passed

All checks passed!