feat: add an avatar size control for author bios

[laurelfulford]

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:

This is a belated avatar size control for the theme to fix a wall I keep running into building some designs. It changes the avatar size in both the single post footer and on the author archive pages, in addition to CSS also controlling the image size. It sets the default to 120px, but should still display as 80px on single posts.

How to test the changes in this Pull Request:

1. Apply the PR.
2. Make sure you have at least one author with Biographical Info populated in their profile, so their bio shows on single posts.
3. View the author profile on a single post and confirm the avatar still displays as 80px (even though it's 120px under the hood).
4. Switch your site to use Newspack Sacha and repeat step 3.
5. View the author profile on an archive page and confirm the avatar still shows as 120px.
6. Navigate to the Customizer > Author Bio Settings and confirm you now have a control to change the author avatar size with a default of 120px.

7. Change the size of the avatar and save changes.
8. Repeat steps 3, 4, 5 and confirm the avatars have picked up your new image size, but they still display the same size.
9. Try changing the avatar size one more time to a value under 32 or over 512; save.
10. Refresh the Customizer; confirm the saved value is either 32 (if you went under) or 512 (if you went over).

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

Adds a new Customizer control to configure the requested author avatar image size, and applies it consistently across author bio templates and author archives to support more flexible design needs in Newspack themes.

Changes:

• Introduces a new author_avatar_size theme mod (default 120px) in the Customizer under Author Bio Settings.
• Updates avatar retrieval in the Newspack and Newspack Sacha author bio templates to use the new setting.
• Updates author archive header avatars to use the new setting.

Reviewed changes

Copilot reviewed 4 out of 4 changed files in this pull request and generated 2 comments.

File	Description
newspack-theme/template-parts/post/author-bio.php	Uses author_avatar_size when requesting author avatars in single post author bio output.
newspack-theme/inc/customizer.php	Adds the Customizer setting/control for author_avatar_size (default 120).
newspack-theme/archive.php	Uses author_avatar_size when requesting author avatars on author archive headers.
newspack-sacha/template-parts/post/author-bio.php	Mirrors the author bio avatar-size behavior for the Sacha child theme.

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