chore: Apply font smoothing inheritance to link variants

[at-susie]

Description

The font-smooth: inherit style was previously applied only to the secondary link variant, resulting in inconsistent text rendering between the primary and secondary links. This PR extends the same font-smooth: inherit behavior to the primary link variant for a consistent appearance.

Related links, issue #, if available: n/a

How has this been tested?

Review checklist

The following items are to be evaluated by the author(s) and the reviewer(s).

Correctness

• Changes include appropriate documentation updates.
• Changes are backward-compatible if not indicated, see CONTRIBUTING.md.
• Changes do not include unsupported browser features, see CONTRIBUTING.md.
• Changes were manually tested for accessibility, see accessibility guidelines.

Security

• If the code handles URLs: all URLs are validated through the checkSafeUrl function.

Testing

• Changes are covered with new/existing unit tests?
• Changes are covered with new/existing integration tests?

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 97.57%. Comparing base (a912f0c) to head (b225607).

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #4705   +/-   ##
=======================================
  Coverage   97.57%   97.57%           
=======================================
  Files         948      948           
  Lines       30516    30516           
  Branches    11166    11167    +1     
=======================================
  Hits        29776    29776           
+ Misses        733      693   -40     
- Partials        7       47   +40     

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