feat: add breadcrumb ui component

[zhangxuhe1]

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• Read CONTRIBUTING.md
• Ensure issue exists and you're assigned
• Link correctly: Fixes #<issue number>
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Summary

Add a new Breadcrumb UI component to the design system with full accessibility support, theme integration, and 100% test coverage. The component provides composable primitives for hierarchical navigation.

Fixes #(issue number)

Type

• 🐛 Bug fix
• ✨ Feature
• 💥 Breaking change
• 📚 Docs
• ♻️ Refactor
• ⚡ Performance

Screenshots (if UI changes)

Component is documented in Storybook. Run pnpm storybook in web/ directory to view examples.

[gemini-code-assist]

Summary of Changes

Hello @zhangxuhe1, I'm Gemini Code Assist¹! I'm currently reviewing this pull request and will post my feedback shortly. In the meantime, here's a summary to help you and other reviewers quickly get up to speed!

This pull request introduces a new Breadcrumb UI component, designed to enhance hierarchical navigation within the application. It prioritizes user experience by providing full accessibility, seamless theme integration, and flexible composable primitives, ensuring clear path indication across various user journeys and screen sizes.

Highlights

• New UI Component: A new Breadcrumb UI component has been added to the design system, providing hierarchical navigation.
• Accessibility & Theming: The component includes full accessibility support and integrates seamlessly with both light and dark themes, utilizing dedicated CSS tokens.
• Composable Primitives: It offers composable primitives (BreadcrumbList, BreadcrumbItem, BreadcrumbLink, BreadcrumbPage, BreadcrumbSeparator, BreadcrumbEllipsis) for flexible and customizable navigation paths.
• Comprehensive Testing & Documentation: The component is thoroughly tested with 100% test coverage and includes extensive Storybook documentation with various usage examples (e.g., ellipsis, custom separators, icons, responsiveness, text truncation).

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[gemini-code-assist]

Code Review

This pull request introduces a well-structured and accessible Breadcrumb component, complete with thorough tests and excellent Storybook documentation. The implementation is solid, following best practices for composable React components. My review includes a couple of suggestions to improve consistency by ensuring all sub-components support ref forwarding, which is a common pattern in the rest of the implementation.

[zhangxuhe1]

/gemini review

[gemini-code-assist]

Code Review

This pull request introduces a well-structured and accessible Breadcrumb component. The implementation is clean, leveraging composition and modern CSS for theming. The accompanying tests and stories are comprehensive. I've included a couple of suggestions to enhance type safety and internationalization, which will improve the component's reusability and maintainability.