Fix phonebook refresh flicker and duplicate Android recent tasks

lib/core/contacts/device_contacts_service.dart

@@ -1,5 +1,6 @@
 import 'dart:io';
 
+import 'package:flutter/foundation.dart';
 import 'package:flutter_contacts/flutter_contacts.dart';
 import 'package:permission_handler/permission_handler.dart';
 import 'package:shared_preferences/shared_preferences.dart';
@@ -84,11 +85,17 @@ class DeviceContactsService {
     return _readBook();
   }
 
-  static Future<bool> reload() async {
+  static Future<bool> reload() => ensureLoadedInteractive(force: true);
+
+  @visibleForTesting
+  static Future<bool> readBookForTesting() => _readBook();
+
+  @visibleForTesting
+  static void resetMemoryForTesting() {
     _loaded = false;
     _byLast10.clear();
     _phonebook.clear();
-    return ensureLoadedInteractive(force: true);
+    _readInFlight = null;
   }
 
   static Future<void> _forgetDenial() async {
@@ -100,30 +107,35 @@ class DeviceContactsService {
       .whenComplete(() => _readInFlight = null);
 
   static Future<bool> _readBookOnce() async {
-    _loaded = false;
-    _byLast10.clear();
-    _phonebook.clear();
     try {
       FlutterContacts.config.includeNonVisibleOnAndroid = true;
       final contacts = await FlutterContacts.getContacts(withProperties: true);
-      _byLast10.clear();
-      _phonebook.clear();
+      final nextByLast10 = <String, String>{};
+      final nextPhonebook = <String, String>{};
       for (final contact in contacts) {
         final name = contact.displayName.trim();
         for (final phone in contact.phones) {
           final normalized = normalizePhone(phone.number);
           if (normalized != null) {
-            _phonebook.putIfAbsent(
+            nextPhonebook.putIfAbsent(
               normalized,
               () => name.isEmpty ? normalized : name,
             );
           }
           final key = _last10(phone.number);
           if (key != null) {
-            _byLast10.putIfAbsent(key, () => name);
+            nextByLast10.putIfAbsent(key, () => name);
           }
         }
       }
+      // Keep the last complete snapshot while the native reader is awaiting.
+      // Replacing both maps synchronously prevents a fallback to server names.
+      _byLast10
+        ..clear()
+        ..addAll(nextByLast10);
+      _phonebook
+        ..clear()
+        ..addAll(nextPhonebook);
       _loaded = true;
       logger.i(
         'Телефонная книга: прочитано ${contacts.length} записей, '

lib/core/utils/update_installer.dart

@@ -3,7 +3,6 @@ import 'dart:io';
 import 'package:crypto/crypto.dart';
 import 'package:device_info_plus/device_info_plus.dart';
 import 'package:flutter/services.dart';
-import 'package:open_filex/open_filex.dart';
 import 'package:package_info_plus/package_info_plus.dart';
 import 'package:path_provider/path_provider.dart';
 
@@ -70,14 +69,18 @@ abstract class UpdateInstaller {
       );
     }
 
-    final opened = await OpenFilex.open(
-      file.path,
-      type: 'application/vnd.android.package-archive',
-    );
-    if (opened.type != ResultType.done) {
+    try {
+      final launched = await _integrityChannel.invokeMethod<bool>(
+        'launchApkInstaller',
+        {'path': file.path},
+      );
+      if (launched != true) {
+        return const UpdateInstallResult(UpdateInstallStatus.installFailed);
+      }
+    } on PlatformException catch (error) {
       return UpdateInstallResult(
         UpdateInstallStatus.installFailed,
-        error: opened.message,
+        error: error.message,
       );
     }
     return const UpdateInstallResult(UpdateInstallStatus.done);