♻️ New auto impl leading

lib/widgets/app_bar_leading.dart

@@ -0,0 +1,18 @@
+import 'package:flutter/material.dart';
+import 'package:responsive_framework/responsive_framework.dart';
+import 'package:surface/widgets/navigation/app_scaffold.dart';
+
+class AutoAppBarLeading extends StatelessWidget {
+  const AutoAppBarLeading({super.key});
+
+  @override
+  Widget build(BuildContext context) {
+    return ResponsiveBreakpoints.of(context).smallerOrEqualTo(MOBILE)
+        ? DrawerButton(onPressed: () {
+            globalRootScaffoldKey.currentState?.openDrawer();
+          })
+        : Navigator.canPop(context)
+            ? BackButton()
+            : const SizedBox();
+  }
+}