feat: move some My Account button styles to the theme

[laurelfulford]

All Submissions:

• Have you followed the Newspack Contributing guideline?
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Changes proposed in this Pull Request:

See Automattic/newspack-plugin#4409

Closes # .

How to test the changes in this Pull Request:

Other information:

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• Have you written new tests for your changes, as applicable?
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[Copilot]

Pull request overview

This PR moves My Account button styles from the Newspack Plugin to the Newspack Theme by creating a new plugin-specific stylesheet. This change supports better separation of concerns, allowing theme-specific styling to be managed within the theme itself.

Changes:

• Added a new stylesheet for Newspack Plugin styles in the theme
• Imported the new stylesheet into the base style file

Reviewed changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated 2 comments.

File	Description
sass/style-base.scss	Added import for new newspack-plugin stylesheet
sass/plugins/newspack-plugin.scss	Created new file containing My Account button styles

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[rbcorrales]

Approving, but I think it's worth addressing the indentation issues flagged by Copilot here.

[github-actions]

Hey @laurelfulford, good job getting this PR merged! 🎉

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