style(pds-copytext): move background color to span element

[pixelflips]

Description

Moves the background color style from the pds-button element to the inner span element in pds-copytext. This ensures the secondary background color is applied only to the text label rather than the entire button, providing correct visual styling for the component.

Fixes DSS-55

Screenshots

Before	After

Type of change

• Bug fix (non-breaking change which fixes an issue)

How Has This Been Tested?

• tested manually

Test Configuration:

• Pine versions: 3.12.0
• OS: macOS
• Browsers: Chrome
• Screen readers: N/A
• Misc: Visual inspection of pds-copytext component

Checklist:

• My code follows the style guidelines of this project
• I have performed a self-review of my code
• I have commented my code, particularly in hard-to-understand areas
• I have made corresponding changes to the documentation
• My changes generate no new warnings
• I have added tests that prove my fix is effective or that my feature works
• New and existing tests pass locally with my changes
• Design has QA'ed and approved this PR

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