Remove sxProp support from deprecated UnderlineNav

[liuliu-dev]

Closes #4827

Changelog

Removed

Removed sx props from deprecated/UnderlineNav

[changeset-bot]

⚠️ No Changeset found

Latest commit: eff6409

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[github-actions]

👋 Hi, this pull request contains changes to the source code that github/github depends on. If you are GitHub staff, we recommend testing these changes with github/github using the integration workflow. Thanks!

[github-actions]

size-limit report 📦

Path	Size
packages/react/dist/browser.esm.js	90.02 KB (0%)
packages/react/dist/browser.umd.js	90.22 KB (0%)

[Copilot]

Pull Request Overview

This PR removes the deprecated sx prop support from the UnderlineNav component as part of cleanup efforts. The changes eliminate all sx-related functionality from the deprecated component and its documentation.

Key Changes

• Removed SxProp type imports and sx function usage from the component
• Cleaned up styled component definitions to remove sx integration
• Updated documentation to remove sx prop references

Reviewed Changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated no comments.

File	Description
packages/react/src/deprecated/UnderlineNav/UnderlineNav.tsx	Removes SxProp imports, sx function calls, and type annotations from component and styled components
packages/react/src/deprecated/UnderlineNav/UnderlineNav.docs.json	Removes sx prop from component documentation