chore: Add font-size consideration for inherit sizing

[at-susie]

Description

Currently, when using size="inherit" on icons (e.g., external link icons), icons are sized based solely on line-height. This caused 16px font-size with 24px line-height to display medium size (20x20) icons instead of normal size (16x16) icons, making icons appear oversized relative to the text.

To address this, this PR adds an additional condition to display medium size icon when both line-height >= 24px AND font-size >= 20px.

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 97.14%. Comparing base (bf484b5) to head (541ac97).
⚠️ Report is 2 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #4160   +/-   ##
=======================================
  Coverage   97.14%   97.14%           
=======================================
  Files         873      873           
  Lines       25653    25657    +4     
  Branches     9283     9283           
=======================================
+ Hits        24921    24925    +4     
  Misses        726      726           
  Partials        6        6           

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