[5.3] - Installation - Fix .bg-warning text color for accessibility

[travisrisner]

Pull Request for Issue #45698.

Summary of Changes

• Changed the hardcoded color: #fff (white text) to color: #000 (black text) for .bg-warning in the installation template SCSS.
• Ensures the warning background now has black text for proper contrast and accessibility compliance.

Testing Instructions

1. Run Joomla installation and observe any element using the .bg-warning class.
2. Confirm that the text appears black on the warning background (instead of white).
3. Check that contrast passes accessibility guidelines.

Actual result BEFORE applying this Pull Request

• .bg-warning text color was hardcoded as white, causing accessibility contrast failures on warning backgrounds during installation.

Expected result AFTER applying this Pull Request

• .bg-warning text color is now black, providing sufficient contrast and passing accessibility checks during installation.

Link to documentations

Please select:

• Documentation link for docs.joomla.org:

• No documentation changes for docs.joomla.org needed

• Pull Request link for manual.joomla.org:

• No documentation changes for manual.joomla.org needed

[brianteeman]

I have tested this item ✅ successfully on 660cbc4

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[QuyTon]

I have tested this item ✅ successfully on 660cbc4

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_{This comment was created with the J!Tracker Application at issues.joomla.org/tracker/joomla-cms/45717.}

[QuyTon]

RTC

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_{This comment was created with the J!Tracker Application at issues.joomla.org/tracker/joomla-cms/45717.}