update

lib/core/services/haptic_service.dart

@@ -0,0 +1,44 @@
+import 'package:flutter/services.dart';
+import 'package:shared_preferences/shared_preferences.dart';
+
+class HapticService {
+  static const _key = 'haptic_enabled';
+  static bool _enabled = true; // runtime cache
+
+  static Future<void> init() async {
+    final prefs = await SharedPreferences.getInstance();
+    _enabled = prefs.getBool(_key) ?? true;
+  }
+
+  static bool get isEnabled => _enabled;
+
+  static Future<void> setEnabled(bool value) async {
+    _enabled = value;
+    final prefs = await SharedPreferences.getInstance();
+    await prefs.setBool(_key, value);
+  }
+
+  // Light tap — filter chips, toggles, small interactions
+  static void light() {
+    if (!_enabled) return;
+    HapticFeedback.lightImpact();
+  }
+
+  // Medium — confirm button, apply, save
+  static void medium() {
+    if (!_enabled) return;
+    HapticFeedback.mediumImpact();
+  }
+
+  // Heavy — long press on balance card
+  static void heavy() {
+    if (!_enabled) return;
+    HapticFeedback.heavyImpact();
+  }
+
+  // Selection click — switching tabs, filter chips
+  static void selection() {
+    if (!_enabled) return;
+    HapticFeedback.selectionClick();
+  }
+}