Updated the App.tsx and Graph.tsx files to improve data visualization in the React application. Changes include rendering conditional graphs, continuous data fetching, and configuring the Graph component for better data presentation.

• Graph Rendering: Modified renderGraph method to conditionally render the graph only when showGraph state is true.
• Continuous Data Fetching: Updated getDataFromServer method to continuously fetch data using setInterval with a guard value for stopping the interval.
• State Management: Ensured setState() is used for state updates outside the constructor.

• HTMLElement Extension: Extended PerspectiveViewerElement to behave like an HTMLElement.
• Simplified DOM Access: Updated componentDidMount to simplify element access using document.getElementsByTagName.
• Graph Configuration: Added and configured attributes:
  • view set to y_line for continuous line graph.
  • column-pivots to distinguish between stocks.
  • row-pivots for x-axis timestamps.
  • columns focused on top_ask_price.
  • aggregates to handle and average duplicated data points.

• The application now renders a continuous line graph with real-time data updates.