dialogKey property
_isLoading = ValueNotifier(true); is declaring an
instance variable [_isLoading[ of type [ValueNotifier
Implementation
/// [final GlobalKey<FormState> dialogKey = GlobalKey<FormState>();[ is creating a
/// [GlobalKey[ object that is used to uniquely identify a [FormState[ object.
/// This is typically used when working with forms in Flutter, where the
/// [GlobalKey[ is used to access the [FormState[ object and perform operations
/// such as validation or resetting the form. In this specific code, it is not
/// being used and can be removed.
final GlobalKey<FormState> dialogKey = GlobalKey<FormState>();