The desktop push-to-talk overlay: dark glass panel (in BOTH themes), waveform on top, recognized text below, hotkey hint bottom-right.

```jsx
const { RecognitionOverlay } = window.DuduDesignSystem_2e0172;
<RecognitionOverlay state="listening" />
<RecognitionOverlay state="streaming"
  finalText="帮我把这份周报整理一下，"
  partialText="重点突出本周的" />
```

finalText = settled (white); partialText = in-flight (gray-blue). Never restyle it light.
