feat/886: Add Default Template global settings for Recommended Content Block

[Sidsector9]

Description of the Change

Closes #886

How to test the Change

1. Visit the page /wp-admin/tools.php?page=classifai#/personalizer/feature_recommended_content.
2. Select a Default Template and save the settings.
3. Follow the instructions from PR Recommended Content Block powered by AI embeddings #881 to insert the Recommended Content Block.
4. Verify if the template set in the block is the same as the Default Template set in the settings.

Screencast:

Screen-2025-05-23-90209.PM.mp4

Changelog Entry

Added - Default Template global settings for Recommended Content Block

Credits

Props @dkotter @Sidsector9

Checklist:

• I agree to follow this project's Code of Conduct.
• I have updated the documentation accordingly.
• I have added Critical Flows, Test Cases, and/or End-to-End Tests to cover my change.
• All new and existing tests pass.

[dkotter]

Thanks for adding this (and apologies on late review here). Left one comment but I think we need to be a bit more strict on the templates here. What I'm seeing now is pagination gets added, which isn't desired for a recommended content section. Is there a way to remove that piece? It also doesn't render in the way I'd expect, it renders stacked now instead of in a column layout.

[dkotter]

Seems neither of these is currently used?

[Sidsector9]

Fixed 👍

[dkotter]

Looks good to me, thanks for the work on this. I think we may want to register our own templates in the future, rather than relying on whatever default templates are registered, to provide a few more options but this looks good as a starting point