fix: Preserve validation styles for disabled inputs

[NathanZlion]

Description

Preserve invalid and warning border styles when adorned Inputs are disabled.
This fix is based on CSS cascade ordering: the disabled modifier must be defined before the validation modifiers so invalid/warning border styles can override the disabled border color when both classes are present. Adding an explicit comment here will help prevent accidental reordering regressions.

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 97.66%. Comparing base (a420fd6) to head (dce3069).
⚠️ Report is 1 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #4959   +/-   ##
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  Coverage   97.66%   97.66%           
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  Files         959      959           
  Lines       31342    31342           
  Branches    11577    11577           
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  Hits        30610    30610           
  Misses        725      725           
  Partials        7        7           

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[Copilot]

Pull request overview

Preserves invalid and warning validation border styles for adorned Input instances when the control is disabled, aligning the adorned-container behavior with the non-adorned input styling model.

Changes:

• Reordered .input-adorned-container modifier blocks so invalid/warning styles can override the disabled border styling in the CSS cascade.
• Added a unit test to ensure the adorned container keeps the invalid modifier when disabled is also set.

Reviewed changes

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

File	Description
src/input/styles.scss	Reorders adorned-container modifier styling to preserve validation borders when disabled.
src/input/tests/adornments.test.tsx	Adds coverage ensuring disabled + invalid retains both modifier classes.

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[gethinwebster]

Can we make sure that this will show up in visual regression tests too? At least the ones that run in pipelines, ideally also the ones that now run in github

[NathanZlion]

Can we make sure that this will show up in visual regression tests too? At least the ones that run in pipelines, ideally also the ones that now run in github

PR #4852 adda the test suite, i've added the permutation here.