ChatWidget class

A floating action button that opens a chat interface with smooth animations.

This widget provides the entry point for users to interact with the chatbot. It displays as a customizable FAB that, when tapped, transitions to a full chat screen using hero animations.

Features:

• Customizable appearance through BotConfiguration
• Smooth open/close animations
• Programmatic opening support
• Avatar or icon display options
• Auto-close timer functionality

Example:

ChatWidget(
  configuration: BotConfiguration(
    userID: 'user123',
    projectSecretKey: 'your-key',
    fabConfiguration: FabConfiguration(
      icon: 'support_agent',
      backgroundColor: '#FF5733',
      buttonSize: 64.0,
    ),
  ),
  onOpen: (isOpen) {
    print('Chat is ${isOpen ? 'open' : 'closed'}');
  },
)