refactor(authenticator): improve comments and streamline state assignment in tests

Author: angelorodem

packages/authenticator/amplify_authenticator/lib/src/widgets/form_field.dart

@@ -198,7 +198,7 @@ abstract class AuthenticatorFormFieldState<
   /// Whether the form field accepts input.
   bool get enabled => true;
 
-  /// Effective enabled state that combines [enabled] with [widget.enabledOverride].
+  /// Effective enabled state that combines [enabled] with [enabledOverride].
   ///
   /// Subclasses can override [enabled] to provide custom logic for determining
   /// the default enabled state. This property ensures the override is respected.
@@ -371,9 +371,7 @@ abstract class AuthenticatorFormFieldState<
       ..add(StringProperty('labelText', labelText))
       ..add(DiagnosticsProperty<double?>('marginBottom', marginBottom))
       ..add(DoubleProperty('labelGap', labelGap))
-      ..add(IterableProperty<String>('autofillHints', autofillHints));
-    properties.add(
-      DiagnosticsProperty<bool>('effectiveEnabled', effectiveEnabled),
-    );
+      ..add(IterableProperty<String>('autofillHints', autofillHints))
+      ..add(DiagnosticsProperty<bool>('effectiveEnabled', effectiveEnabled));
   }
 }

packages/authenticator/amplify_authenticator/test/form_field_controller_test.dart

@@ -461,10 +461,9 @@ void main() {
       await tester.pumpAndSettle();
 
       final signUpContext = tester.element(find.byType(SignUpForm));
-      var authState = InheritedAuthenticatorState.of(signUpContext);
-
-      // Set state value
-      authState.address = 'Initial Address';
+      var authState = InheritedAuthenticatorState.of(signUpContext)
+        // Set state value
+        ..address = 'Initial Address';
       await tester.pump();
 
       // Rebuild with controller