NxCustomDrawer class

A customizable drawer widget with support for navigation options and sign-out functionality.

This widget extends Flutter's Drawer with additional features:

• Configurable navigation options with icons
• Optional sign-out button at the bottom
• Customizable header (defaults to "Menu")
• Theme-aware styling with customization options
• Optional Sequrify branding button

The drawer automatically handles navigation state and closing when an option is selected.

Example usage:

NxCustomDrawer(
  drawerOptions: {
    ['Profile', Icon(Icons.person_outline)]: () {
      // Handle profile navigation
    },
    ['Settings', Icon(Icons.settings_outline)]: () {
      // Handle settings navigation
    },
  },
  withSignOutOption: true,
  signOutFunction: () {
    // Handle sign out
  },
  backgroundColor: Colors.white,
  optionTextStyle: TextStyle(fontSize: 16),
)

The drawer options are specified using a map where:

• The key is a list containing the option text and an optional icon
• The value is a callback function executed when the option is tapped