Keycap chip for shortcuts — core to dudu's push-to-talk identity.

```jsx
const { Kbd, HotkeyCombo } = window.DuduDesignSystem_2e0172;
<HotkeyCombo keys={['⌘', '⇧', 'Space']} />  // 按住说话快捷键
<Kbd>Enter</Kbd>
```

Use unicode modifier symbols (⌘ ⇧ ⌥ ⌃), not words.
