refactor(author-profile): move social button styles to plugin

[rbcorrales]

All Submissions:

• Have you followed the Newspack Contributing guideline?
• Does your code follow the WordPress' coding standards and VIP Go coding standards?
• Have you checked to ensure there aren't other open Pull Requests for the same update/change?

Changes proposed in this Pull Request:

Removes the Author Profile social button styles from the theme. These styles are now provided by the social blocks themselves in newspack-plugin via a shared socialButton SCSS mixin, so they render consistently across all block themes without requiring theme-specific CSS.

Closes NPPD-1147.

Related PRs:

• feat(author-profile): add block theme compatibility newspack-blocks#2286
• feat(author-profile): avatar and social blocks for nested author profile newspack-plugin#4448

How to test the changes in this Pull Request:

Requires the companion newspack-blocks and newspack-plugin branches.

1. Activate the block theme with all three companion branches.
2. View an Author Profile block with social links on the frontend.
3. Verify the social icons still have circular backgrounds with hover effects.
4. Verify there is no duplicate or conflicting styling from the theme.

Other information:

• Have you added an explanation of what your changes do and why you'd like us to include them?
• Have you written new tests for your changes, as applicable?
• Have you successfully ran tests with your changes locally?

[Copilot]

Pull request overview

Removes theme-level styling for the Author Profile block’s social links so that social button styling is instead consistently provided by the newspack-plugin/social blocks (via a shared socialButton SCSS mixin), avoiding duplicate/conflicting CSS across themes.

Changes:

• Deleted .wp-block-newspack-blocks-author-profile__social-links styling from the theme SCSS.
• Removed the .has-background override that previously adjusted social link button colors via currentcolor.

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[laurelfulford]

This is looking good, @rbcorrales!

Sorry it's taken me so long to get to this collection of PRs - I'm slowly working on the other ones, but there's a lot of changes there and I'm a little slow 😅

[github-actions]

🎉 This PR is included in version 1.25.0-alpha.1 🎉

The release is available on GitHub release

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