🎨 Use feature based folder structure

lib/core/data_saving_gate.dart

@@ -0,0 +1,27 @@
+import 'package:flutter/material.dart';
+import 'package:hooks_riverpod/hooks_riverpod.dart';
+import 'package:island/core/config.dart';
+
+typedef WidgetBuilder = Widget Function();
+
+class DataSavingGate extends ConsumerWidget {
+  final bool bypass;
+  final WidgetBuilder content;
+  final Widget placeholder;
+
+  const DataSavingGate({
+    super.key,
+    required this.bypass,
+    required this.content,
+    required this.placeholder,
+  });
+
+  @override
+  Widget build(BuildContext context, WidgetRef ref) {
+    final dataSaving = ref.watch(
+      appSettingsProvider.select((s) => s.dataSavingMode),
+    );
+    if (bypass || !dataSaving) return content();
+    return placeholder;
+  }
+}