PillButton class

ElevatedButton wrapper to display a pill-shaped button with text and an optional leading widget.

The text argument is required and should be a non-empty string to display as the label in the button.

The leading argument is optional and specifies the widget to display as the leading content of the button. The PillButton.icon factory constructor makes leading required.

The onTap argument is optional and provides a callback that will be called when the button is tapped.

The isEnabled argument is optional and defaults to true. If set to false, the button will be disabled and won't be tappable.

The isLoading argument is optional and defaults to false. If set to true, the button will display a circular progress indicator and won't be tappable.

Example:

PillButton(
  text: 'Click me',
  leading: Icon(Icons.ac_unit),
  onTap: () => print('Button tapped'),
  isEnabled: true,
  isLoading: false,
)

PillButton.icon(
  text: 'Click me',
  leading: Icon(Icons.ac_unit),
  onTap: () => print('Button tapped'),
  isEnabled: true,
  isLoading: false,
)