Function ChatWidget

ChatWidget(__namedParameters: ChatWidgetProps): ReactElement
ChatWidget - A universally compatible chat UI component

New simplified approach:
- Inherits typography from parent by default
- Uses only 4 CSS custom properties for theming
- Minimal opinionated styles for maximum compatibility
- No complex animations or shadows
Parameters
- __namedParameters: ChatWidgetProps
Returns ReactElement
Example
```
// Zero configuration - inherits from parent
<ChatWidget />

// With minimal theme
<ChatWidget
  minimalTheme={{
    primary: '#FF6B6B',
    surface: '#F8F9FA'
  }}
/>
```
- Defined in components/ChatWidget.tsx:95