refactor: FunctionSignature return type container

[canerakdas]

Description

As discussed on Slack, this PR includes moving the first return in the FunctionSignature component outside of the container.

Validation

[vercel]

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Project	Deployment	Actions	Updated (UTC)
nodejs-org	Ready	Preview	Mar 14, 2026 8:07am

[github-actions]

👋 Codeowner Review Request

The following codeowners have been identified for the changed files:

Team reviewers: @nodejs/nodejs-website

Please review the changes when you have a chance. Thank you! 🙏

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 75.11%. Comparing base (62a66aa) to head (3fcee57).
⚠️ Report is 1 commits behind head on main.
✅ All tests successful. No failed tests found.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #8717      +/-   ##
==========================================
+ Coverage   75.10%   75.11%   +0.01%     
==========================================
  Files         104      104              
  Lines        9167     9167              
  Branches      315      315              
==========================================
+ Hits         6885     6886       +1     
+ Misses       2280     2279       -1     
  Partials        2        2              

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[github-actions]

Lighthouse Results

URL	Performance	Accessibility	Best Practices	SEO	Report
/en	🟢 96	🟢 93	🟢 100	🟢 100	🔗
/en/about	🟢 99	🟢 94	🟢 100	🟠 88	🔗
/en/about/previous-releases	🟢 97	🟢 97	🟢 100	🟢 100	🔗
/en/download	🟢 99	🟢 96	🟠 81	🟢 100	🔗
/en/download/archive/current	🟢 100	🟢 97	🟢 100	🟢 100	🔗
/en/blog	🟢 100	🟢 97	🟢 96	🟢 100	🔗

[Copilot]

Pull request overview

This PR adjusts how FunctionSignature renders return types so that top-level kind: 'return' entries are displayed outside the titled signature container, aligning the UI with the Slack discussion and provided validation screenshot.

Changes:

• Split items into non-return “attributes” vs. kind: 'return' entries and render them separately when a title is provided.
• Extend the Storybook Nested story to include an additional top-level return example.
• Add bottom spacing to the SignatureRoot container and bump @node-core/ui-components version to 1.6.3.

Reviewed changes

Copilot reviewed 4 out of 4 changed files in this pull request and generated 1 comment.

File	Description
packages/ui-components/src/Containers/FunctionSignature/index.tsx	Separates top-level return items from attribute items when rendering a titled signature.
packages/ui-components/src/Containers/FunctionSignature/index.stories.tsx	Adds a nested story case with a top-level return entry to validate the new layout.
packages/ui-components/src/Common/Signature/SignatureRoot/index.module.css	Adds mb-1 to the signature root container to improve spacing between sections.
packages/ui-components/package.json	Bumps the package version from 1.6.2 to 1.6.3.

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[ovflowd]

Really good stuff <3