Textual App Lifecycle Purpose Understand and implement proper Textual application lifecycle patterns including initialization, mounting, screen management, background workers, and graceful shutdown. This is the foundation for building robust TUI applications. Quick Start Instructions Step 1: Define App Class and Metadata Create your App subclass with proper metadata and configuration: Step 2: Implement Application Composition Define to return all top-level widgets: Key Points: - is synchronous - don't use - Widgets are yielded in order (they appear top-to-bottom) - Use Container, Horizontal,…