Update follow return types and error handling

[pfefferle]

Changed the return type documentation for follow methods to only return WP_Post or WP_Error. Improved error handling in Following::follow by returning a WP_Error if adding to outbox fails.

Fixes #2092

Proposed changes:

• Updated docstring return types from int|false|\WP_Post|\WP_Error to \WP_Post|\WP_Error
• Enhanced error handling in Following::follow to return a WP_Error when add_to_outbox fails

Other information:

• Have you written new tests for your changes, if applicable?

Testing instructions:

• See tests.

Changelog entry

• Automatically create a changelog entry from the details below.

Changelog Entry Details

Significance

• Patch
• Minor
• Major

Type

• Added - for new features
• Changed - for changes in existing functionality
• Deprecated - for soon-to-be removed features
• Removed - for now removed features
• Fixed - for any bug fixes
• Security - in case of vulnerabilities

Message

[Copilot]

Pull Request Overview

This PR updates the return type documentation for follow methods to be more accurate and improves error handling by returning a WP_Error when adding to outbox fails.

• Updated docstring return types from int|false|\WP_Post|\WP_Error to \WP_Post|\WP_Error
• Enhanced error handling in Following::follow to return a WP_Error when add_to_outbox fails

Reviewed Changes

Copilot reviewed 3 out of 3 changed files in this pull request and generated 1 comment.

File	Description
includes/functions.php	Updated docstring return type for the follow function
includes/collection/class-following.php	Updated docstring return type and added error handling for failed outbox operations

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