Expand Link underline to full width

[rezrah]

Summary

Resolves https://github.com/primer/brand/issues/806

Increases width of underline on the Link component on hover interaction. See before and after videos below.

What should reviewers focus on?

• Ensure that the underline extends to end of text label

Steps to test:

1. Use the Storybook examples

Supporting resources (related issues, external links, etc):

-

Contributor checklist:

• [ ] All new and existing CI checks pass
• [ ] Tests prove that the feature works and covers both happy and unhappy paths
• [ ] Any drop in coverage, breaking changes or regressions have been documented above
• [ ] UI Changes contain new visual snapshots (generated by adding update snapshots label to the PR)
• [ ] All developer debugging and non-functional logging has been removed
• [ ] Related issues have been referenced in the PR description

Reviewer checklist:

• [ ] Check that pull request and proposed changes adhere to our contribution guidelines and code of conduct
• [ ] Check that tests prove the feature works and covers both happy and unhappy paths
• [ ] Check that there aren't other open Pull Requests for the same update/change

Screenshots:

Please try to provide before and after screenshots or videos

Before	After
https://github.com/user-attachments/assets/a2c5b0f0-4d47-4495-9400-30abfd3928e6	https://github.com/user-attachments/assets/4e110a0c-55c9-4e5b-85d1-4b9a67c0f5d4

[changeset-bot[bot]]

🦋 Changeset detected

Latest commit: 65962a20b73662cf6cefefaa87a2c6a73aaf2571

The changes in this PR will be included in the next version bump.

This PR includes changesets to release 6 packages

| Name | Type | | ------------------------ | ----- | | @primer/react-brand | Patch | | @primer/brand-primitives | Patch | | @primer/brand-e2e | Patch | | @primer/brand-fonts | Patch | | @primer/brand-config | Patch | | @primer/brand-storybook | Patch |

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

[github-actions[bot]]

🟢 No design token changes found

[github-actions[bot]]

🟢 No visual differences found

Our visual comparison tests did not find any differences in the UI.