Function LoadingBackdrop

LoadingBackdrop(props: LoadingBackdropProps): Element
A full-screen loading overlay component with a spinning benzene molecule and stop button. The spinner has a delayed fade-in animation when the backdrop is opened.
Parameters
- props: LoadingBackdropProps
  Component properties containing:
  
  open: Controls the visibility of the backdrop
  
  onClick: Callback function triggered when the stop button is clicked
Returns Element
A loading backdrop component
Example
```
<LoadingBackdrop
  open={isLoading}
  onClick={handleStopLoading}
/>
```
Future improvements:
- Implement a Suspense component instead of manual loading state
- Add a timer to show the Stop Search button after a delay
- Defined in src/components/LoadingBackdrop.tsx:26

src