SG-40910 Fix banner text contrast on macOS in Adobe apps

[julien-lang]

Problem

The banner info message displayed at the top of the Loader after triggering actions had poor contrast on macOS, especially in Photoshop and After Effects. The text appeared in beige color on a blue background, making it nearly unreadable.

Solution

Changed the banner text color from palette().text() to palette().highlightedText(). The highlightedText() color role is specifically designed for text displayed on highlight-colored backgrounds, ensuring proper contrast across all platforms.

Testing

• Verify banner messages display with good contrast on macOS in Photoshop and After Effects
• Confirm no visual regression on Windows or other DCCs

Fixes: SG-40910

[Copilot]

Pull request overview

This PR fixes a contrast issue with banner text in the Loader on macOS, particularly in Adobe applications like Photoshop and After Effects, where text appeared in beige on blue making it difficult to read.

Changes:

• Updated banner text color to use the appropriate palette role for highlighted backgrounds

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 19.72%. Comparing base (319e494) to head (d040144).
⚠️ Report is 28 commits behind head on master.

❗ There is a different number of reports uploaded between BASE (319e494) and HEAD (d040144). Click for more details.

HEAD has 16 uploads less than BASE

Flag	BASE (319e494)	HEAD (d040144)
	16	0

Additional details and impacted files

@@             Coverage Diff             @@
##           master     #132       +/-   ##
===========================================
- Coverage   77.09%   19.72%   -57.38%     
===========================================
  Files          33       35        +2     
  Lines        2633     2794      +161     
===========================================
- Hits         2030      551     -1479     
- Misses        603     2243     +1640     

Flag	Coverage Δ
Linux	19.72% <ø> (?)
Python-3.10	19.72% <ø> (?)
Python-3.11	19.72% <ø> (?)
Python-3.9	19.72% <ø> (?)
Windows	19.72% <ø> (?)
macOS	19.72% <ø> (?)

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