fix: pincode functionality

lib/viewmodels/pin_lock_view_model.dart

@@ -1,16 +1,19 @@
 import 'package:flutter/foundation.dart';
 
 import '../services/pin_lock_service.dart';
+import '../services/settings_service.dart';
 
 class PinLockViewModel extends ChangeNotifier {
   final PinLockService pinLockService;
+  final SettingsService? settingsService;
 
-  PinLockViewModel({required this.pinLockService});
+  PinLockViewModel({required this.pinLockService, this.settingsService});
 
   bool _isPinSet = false;
   bool _isUnlocked = false;
   bool _isLoading = false;
   bool _hasLoaded = false;
+  bool _pinRequired = true;
   String? _errorMessage;
 
   bool get isPinSet => _isPinSet;
@@ -21,8 +24,16 @@ class PinLockViewModel extends ChangeNotifier {
 
   bool get hasLoaded => _hasLoaded;
 
+  bool get pinRequired => _pinRequired;
+
   String? get errorMessage => _errorMessage;
 
+  void setPinRequired(bool value) {
+    if (_pinRequired == value) return;
+    _pinRequired = value;
+    notifyListeners();
+  }
+
   Future<void> ensureLoaded() async {
     if (_hasLoaded || _isLoading) return;
 
@@ -39,6 +50,12 @@ class PinLockViewModel extends ChangeNotifier {
 
     try {
       _isPinSet = await pinLockService.hasPin();
+
+      final svc = settingsService;
+      if (svc != null) {
+        final settings = await svc.getSettings();
+        _pinRequired = settings.pinRequired;
+      }
     } catch (_) {
       _errorMessage = 'Could not check PIN status.';
     } finally {
@@ -58,6 +75,14 @@ class PinLockViewModel extends ChangeNotifier {
       await pinLockService.setPin(pin);
       _isPinSet = true;
       _isUnlocked = true;
+      _pinRequired = true;
+
+      final svc = settingsService;
+      if (svc != null) {
+        final current = await svc.getSettings();
+        await svc.saveSettings(current.copyWith(pinRequired: true));
+      }
+
       notifyListeners();
       return true;
     } catch (_) {
@@ -118,6 +143,14 @@ class PinLockViewModel extends ChangeNotifier {
 
     await pinLockService.clearPin();
     _isPinSet = false;
+    _pinRequired = false;
+
+    final svc = settingsService;
+    if (svc != null) {
+      final current = await svc.getSettings();
+      await svc.saveSettings(current.copyWith(pinRequired: false));
+    }
+
     notifyListeners();
     return true;
   }