fix: честные ошибки при вводе пароля и дубликат в Keychain

lib/backend/modules/account.dart

@@ -488,7 +488,7 @@ class AccountModule {
     final data = _requireMapPayload(packet, 'checkPassword');
 
     if (data['error'] != null) {
-      throw Exception('checkPassword: неверный пароль');
+      throw const WrongPasswordException();
     }
 
     final tokenAttrs = data['tokenAttrs'];

lib/backend/modules/account/account_models.dart

@@ -290,6 +290,12 @@ class WrongDeviceTokenException implements Exception {
   String toString() => 'WrongDeviceTokenException';
 }
 
+class WrongPasswordException implements Exception {
+  const WrongPasswordException();
+  @override
+  String toString() => 'WrongPasswordException';
+}
+
 class RequestCodeResult {
   final String token;
 

lib/backend/modules/account/two_factor_module.dart

@@ -124,7 +124,7 @@ class TwoFactorModule extends AccountApiBase {
     checkPacketError(packet, 'check2faPassword');
     final data = packet.payload;
     if (data is Map && data['error'] != null) {
-      throw Exception('Неверный пароль');
+      throw const WrongPasswordException();
     }
   }
 

lib/core/storage/token_storage.dart

@@ -1,3 +1,4 @@
+import 'package:flutter/services.dart' show PlatformException;
 import 'package:flutter_secure_storage/flutter_secure_storage.dart';
 import 'package:shared_preferences/shared_preferences.dart';
 
@@ -14,10 +15,25 @@ class TokenStorage {
     mOptions: MacOsOptions(usesDataProtectionKeychain: false),
   );
 
-  static Future<void> writeSecure(String key, String value) async {
-    await _secure.write(key: key, value: value);
+  static const int _duplicateKeychainItem = -25299;
+
+  static bool _isDuplicateItem(PlatformException error) =>
+      error.details == _duplicateKeychainItem ||
+      (error.message?.contains('$_duplicateKeychainItem') ?? false);
+
+  static Future<void> _write(String key, String value) async {
+    try {
+      await _secure.write(key: key, value: value);
+    } on PlatformException catch (e) {
+      if (!_isDuplicateItem(e)) rethrow;
+      await _secure.delete(key: key);
+      await _secure.write(key: key, value: value);
+    }
   }
 
+  static Future<void> writeSecure(String key, String value) =>
+      _write(key, value);
+
   static Future<String?> readSecure(String key) async {
     return _secure.read(key: key);
   }
@@ -31,9 +47,8 @@ class TokenStorage {
     return all.keys.where((key) => key.startsWith(prefix)).toList();
   }
 
-  static Future<void> saveToken(String token, int accountId) async {
-    await _secure.write(key: '$_tokenPrefix$accountId', value: token);
-  }
+  static Future<void> saveToken(String token, int accountId) =>
+      _write('$_tokenPrefix$accountId', token);
 
   static Future<String?> readToken(int accountId) async {
     final key = '$_tokenPrefix$accountId';
@@ -43,7 +58,7 @@ class TokenStorage {
     final prefs = await SharedPreferences.getInstance();
     final legacy = prefs.getString(key);
     if (legacy != null) {
-      await _secure.write(key: key, value: legacy);
+      await _write(key, legacy);
       await prefs.remove(key);
       return legacy;
     }

lib/frontend/screens/auth/password_2fa_screen.dart

@@ -1,6 +1,8 @@
 import 'package:flutter/material.dart';
 import 'package:material_symbols_icons/symbols.dart';
+import '../../../backend/modules/account/account_models.dart';
 import '../../../core/protocol/packet.dart';
+import '../../../l10n/app_localizations.dart';
 import '../../../main.dart';
 import '../../widgets/animated_slash_icon.dart';
 import '../../widgets/custom_notification.dart';
@@ -101,10 +103,13 @@ class _Password2FAScreenState extends State<Password2FAScreen>
         _isLoading = false;
       });
 
+      final l10n = AppLocalizations.of(context)!;
       if (!passed && (isSessionStateError(e) || sessionStale)) {
         recoverStaleSession();
+      } else if (e is WrongPasswordException) {
+        showCustomNotification(context, l10n.passwordEntryWrongPassword);
       } else {
-        showCustomNotification(context, 'Неверный пароль: $e');
+        showCustomNotification(context, l10n.devicesGenericError('$e'));
       }
     }
   }

lib/frontend/screens/profile/password_entry_screen.dart

@@ -1,7 +1,6 @@
 import 'package:flutter/material.dart';
 import 'package:material_symbols_icons/symbols.dart';
 import '../../../main.dart' show accountModule;
-import '../../../backend/modules/account.dart' show TwoFactorDetails;
 import '../../../core/storage/app_database.dart';
 import '../../../l10n/app_localizations.dart';
 import '../../widgets/animated_slash_icon.dart';
@@ -11,6 +10,13 @@ import '../../widgets/primary_loading_button.dart';
 import '../../widgets/small_spinner.dart';
 import '../../../core/config/app_fonts.dart';
 import '../../../core/config/app_shape.dart';
+import '../../../backend/modules/account/account_models.dart';
+
+
+String _passwordErrorText(Object error, AppLocalizations l10n) =>
+    error is WrongPasswordException
+        ? l10n.passwordEntryWrongPassword
+        : l10n.devicesGenericError('$error');
 
 class PasswordEntryScreen extends StatefulWidget {
   const PasswordEntryScreen({super.key});
@@ -56,12 +62,13 @@ class _PasswordEntryScreenState extends State<PasswordEntryScreen> {
         _details = details;
       });
       _passwordController.clear();
-    } catch (_) {
+    } catch (e) {
       if (mounted) {
         setState(
-          () => _errorMessage = AppLocalizations.of(
-            context,
-          )!.passwordEntryWrongPassword,
+          () => _errorMessage = _passwordErrorText(
+            e,
+            AppLocalizations.of(context)!,
+          ),
         );
       }
     } finally {
@@ -621,7 +628,14 @@ class _TwoFactorSetupScreenState extends State<TwoFactorSetupScreen> {
           break;
       }
     } catch (e) {
-      if (mounted) setState(() => _errorMessage = e.toString());
+      if (mounted) {
+        setState(
+          () => _errorMessage = _passwordErrorText(
+            e,
+            AppLocalizations.of(context)!,
+          ),
+        );
+      }
     } finally {
       if (mounted) {
         _isLoading.value = false;
@@ -1011,7 +1025,14 @@ class _TwoFactorPasswordChangeScreenState
         Navigator.popUntil(context, ModalRoute.withName('SecurityScreen'));
       }
     } catch (e) {
-      if (mounted) setState(() => _errorMessage = e.toString());
+      if (mounted) {
+        setState(
+          () => _errorMessage = _passwordErrorText(
+            e,
+            AppLocalizations.of(context)!,
+          ),
+        );
+      }
     } finally {
       if (mounted) _isLoading.value = false;
     }
@@ -1182,7 +1203,14 @@ class _TwoFactorEmailChangeScreenState
           break;
       }
     } catch (e) {
-      if (mounted) setState(() => _errorMessage = e.toString());
+      if (mounted) {
+        setState(
+          () => _errorMessage = _passwordErrorText(
+            e,
+            AppLocalizations.of(context)!,
+          ),
+        );
+      }
     } finally {
       if (mounted) _isLoading.value = false;
     }
@@ -1335,7 +1363,14 @@ class _TwoFactorRemoveScreenState extends State<TwoFactorRemoveScreen> {
         Navigator.popUntil(context, ModalRoute.withName('SecurityScreen'));
       }
     } catch (e) {
-      if (mounted) setState(() => _errorMessage = e.toString());
+      if (mounted) {
+        setState(
+          () => _errorMessage = _passwordErrorText(
+            e,
+            AppLocalizations.of(context)!,
+          ),
+        );
+      }
     } finally {
       if (mounted) _isLoading.value = false;
     }