WindowController class

Reactive controller for managing window state and operations.

Provides programmatic control over window properties with automatic UI updates through ValueNotifier pattern. Handles window state management, validation, and coordination with the window widget lifecycle.

Key Capabilities:

• Reactive Updates: Automatic UI refresh when state changes
• Property Management: Convenient getters/setters for window properties
• Lifecycle Handling: Mount/unmount detection and validation
• State Validation: Ensures state consistency and constraint compliance
• Handle Management: Coordination with underlying window implementation

Usage Pattern:

1. Create controller with initial window configuration
2. Pass to Window.controlled() constructor
3. Modify properties programmatically (bounds, minimized, etc.)
4. UI automatically updates to reflect changes
5. Listen to controller for state change notifications

Example:

final controller = WindowController(
  bounds: Rect.fromLTWH(100, 100, 800, 600),
  resizable: true,
  draggable: true,
);

// Programmatic control
controller.bounds = Rect.fromLTWH(200, 200, 900, 700);
controller.minimized = true;
controller.maximized = Rect.fromLTWH(0, 0, 1920, 1080);

// Listen for changes
controller.addListener(() {
  print('Window state changed: ${controller.value}');
});