phsl / new-api

• Removed the custom `renderArrow` helper and its `Dropdown`-based arrow navigation, simplifying the component logic.
• Switched the `<Tabs>` component to rely on Semi UI’s built-in behaviour (no more `renderArrow` override).
• Kept `type="card"` and `collapsible` props for consistent visual appearance while still using the default style.
• Eliminated the now-unused `Dropdown` import.

This cleanup reduces bespoke UI code, makes future maintenance easier, and keeps the interface consistent with the rest of the application.