Function WhiteboardSession

WhiteboardSession(__namedParameters?: WhiteboardSessionProps): Element | null
WhiteboardSession - Complete whiteboard session management component

Wraps Whiteboard with session management including:
- Empty state with file list of saved whiteboards
- CreateWhiteboardDialog for creating new whiteboards
- Automatic close handling
Unlike other Session components, Whiteboard doesn't need a SessionHeader because the Whiteboard component has its own close button when a file is open.

This is the recommended component for sidebar integration as it handles all session lifecycle management internally.
Parameters
- __namedParameters: WhiteboardSessionProps = {}
Returns Element | null
Example
```
// In Sidebar.tsx
case 'whiteboard':
  return <WhiteboardSession />;

// With customization
<WhiteboardSession
  labels={{
    emptyState: { message: 'Draw and collaborate' },
  }}
  whiteboardProps={{
    showZoomControls: true,
  }}
/>
```
- Defined in packages/react-whiteboard/src/components/WhiteboardSession.tsx:83