fix(25584): Set action column background

[zeeklop]

Added back the background color to the Actions column

closes: #25584

/nocl

Description

Motivation and Context

How Has This Been Tested?

Screenshots (if appropriate):

Types of changes

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Refactoring (non-breaking change)
• Breaking change (fix or feature that would cause existing functionality to change)

Checklist:

• My code follows the code style of this project.
• My change requires a change to the documentation.
• I have requested a documentation update.
• I have read the CONTRIBUTING document.
• I have added tests to cover my changes.

[Copilot]

Pull request overview

Restores a non-transparent background for the EntityDataTable “Actions” column so the pinned/sticky actions area doesn’t visually blend with underlying content.

Changes:

• Default the actions column background to the theme’s global.contentBackground when no parentBgColor is provided.

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[Copilot]

BackgroundFoundation declares $parentBgColor as a required string, but the component is passed parentBgColor: string | undefined and the style logic uses ?? to handle the undefined case. To keep the typing consistent with actual usage (and the fallback behavior), make $parentBgColor optional (or string | undefined) in the styled-component props type.

Suggested change

	const BackgroundFoundation = styled.div<{ $parentBgColor: string }>(
	const BackgroundFoundation = styled.div<{ $parentBgColor?: string }>(