chore: upgrade flutter_lints to ^6.0.0, fix resulting lint warnings

- Bump flutter_lints ^2.0.1 → ^6.0.0 in main package
- Update flutter SDK lower bound from ">=0.2.5" → ">=3.10.0" to match
  the Dart >=3.0.0 constraint (Dart 3.0 shipped with Flutter 3.10)
- Example app: replace discontinued pedantic ^1.11.1 with flutter_lints
  ^6.0.0, remove unused integration_test dep, bump cupertino_icons to
  ^1.0.8, add flutter SDK lower bound
- Fix 3 use_super_parameters lint warnings in Badge, BadgePositioned,
  and TestWidgetScreen constructors

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

Author: yadaniyil

example/pubspec.yaml

@@ -3,22 +3,21 @@ description: A new Flutter project.
 
 environment:
   sdk: ">=3.0.0 <4.0.0"
+  flutter: ">=3.10.0"
 
 dependencies:
   flutter:
     sdk: flutter
 
-  cupertino_icons: ^1.0.4
+  cupertino_icons: ^1.0.8
 
   badges:
     path: ../
 
 dev_dependencies:
-  integration_test:
-    sdk: flutter
-  pedantic: ^1.11.1
   flutter_test:
     sdk: flutter
+  flutter_lints: ^6.0.0
 
 flutter:
   uses-material-design: true

lib/src/badge.dart

@@ -6,7 +6,7 @@ import 'package:flutter/material.dart';
 
 class Badge extends StatefulWidget {
   const Badge({
-    Key? key,
+    super.key,
     this.badgeContent,
     this.child,
     this.badgeStyle = const BadgeStyle(),
@@ -16,7 +16,7 @@ class Badge extends StatefulWidget {
     this.ignorePointer = false,
     this.stackFit = StackFit.loose,
     this.onTap,
-  }) : super(key: key);
+  });
 
   /// The badge child, e.g. cart icon button.
   final Widget? child;

lib/src/badge_positioned.dart

@@ -17,8 +17,7 @@ class BadgePositioned extends StatelessWidget {
   ///
   /// See also:
   /// * [PositionedDirectional]
-  const BadgePositioned({Key? key, this.position, required this.child})
-      : super(key: key);
+  const BadgePositioned({super.key, this.position, required this.child});
 
   @override
   Widget build(BuildContext context) {

pubspec.yaml

@@ -11,11 +11,11 @@ dependencies:
 dev_dependencies:
   flutter_test:
     sdk: flutter
-  flutter_lints: ^2.0.1
+  flutter_lints: ^6.0.0
 
 environment:
   sdk: ">=3.0.0 <4.0.0"
-  flutter: ">=0.2.5"
+  flutter: ">=3.10.0"
 
 screenshots:
   - description: "Shopping cart with badge for pub.dev preview"

test/test_widget_screen.dart

@@ -16,7 +16,7 @@ class TestWidgetScreen extends StatefulWidget {
   final bool ignorePointer;
 
   const TestWidgetScreen({
-    Key? key,
+    super.key,
     required this.badgeAnimationType,
     required this.animationDuration,
     required this.appearanceDuration,
@@ -27,7 +27,7 @@ class TestWidgetScreen extends StatefulWidget {
     this.toChangeContent = true,
     this.appearanceDisappearanceFadeAnimationEnabled = true,
     this.ignorePointer = false,
-  }) : super(key: key);
+  });
 
   @override
   State<TestWidgetScreen> createState() => _TestWidgetScreenState();