diff --git a/core/pubspec.lock b/core/pubspec.lock
index 4f8ae6a18..65cc6eb53 100644
--- a/core/pubspec.lock
+++ b/core/pubspec.lock
@@ -1,6 +1,22 @@
 # Generated by pub
 # See https://dart.dev/tools/pub/glossary#lockfile
 packages:
+  _fe_analyzer_shared:
+    dependency: transitive
+    description:
+      name: _fe_analyzer_shared
+      sha256: ae92f5d747aee634b87f89d9946000c2de774be1d6ac3e58268224348cd0101a
+      url: "https://pub.dev"
+    source: hosted
+    version: "61.0.0"
+  analyzer:
+    dependency: transitive
+    description:
+      name: analyzer
+      sha256: ea3d8652bda62982addfd92fdc2d0214e5f82e43325104990d4f4c4a2a313562
+      url: "https://pub.dev"
+    source: hosted
+    version: "5.13.0"
   archive:
     dependency: transitive
     description:
@@ -49,6 +65,54 @@ packages:
       url: "https://pub.dev"
     source: hosted
     version: "2.1.1"
+  build:
+    dependency: transitive
+    description:
+      name: build
+      sha256: "3fbda25365741f8251b39f3917fb3c8e286a96fd068a5a242e11c2012d495777"
+      url: "https://pub.dev"
+    source: hosted
+    version: "2.3.1"
+  build_config:
+    dependency: transitive
+    description:
+      name: build_config
+      sha256: bf80fcfb46a29945b423bd9aad884590fb1dc69b330a4d4700cac476af1708d1
+      url: "https://pub.dev"
+    source: hosted
+    version: "1.1.1"
+  build_daemon:
+    dependency: transitive
+    description:
+      name: build_daemon
+      sha256: "757153e5d9cd88253cb13f28c2fb55a537dc31fefd98137549895b5beb7c6169"
+      url: "https://pub.dev"
+    source: hosted
+    version: "3.1.1"
+  build_resolvers:
+    dependency: transitive
+    description:
+      name: build_resolvers
+      sha256: "339086358431fa15d7eca8b6a36e5d783728cf025e559b834f4609a1fcfb7b0a"
+      url: "https://pub.dev"
+    source: hosted
+    version: "2.4.2"
+  build_runner:
+    dependency: "direct dev"
+    description:
+      name: build_runner
+      sha256: b0a8a7b8a76c493e85f1b84bffa0588859a06197863dba8c9036b15581fd9727
+      url: "https://pub.dev"
+    source: hosted
+    version: "2.3.3"
+  build_runner_core:
+    dependency: transitive
+    description:
+      name: build_runner_core
+      sha256: "0671ad4162ed510b70d0eb4ad6354c249f8429cab4ae7a4cec86bbc2886eb76e"
+      url: "https://pub.dev"
+    source: hosted
+    version: "7.2.7+1"
   built_collection:
     dependency: "direct main"
     description:
@@ -57,6 +121,14 @@ packages:
       url: "https://pub.dev"
     source: hosted
     version: "5.1.1"
+  built_value:
+    dependency: transitive
+    description:
+      name: built_value
+      sha256: c7913a9737ee4007efedaffc968c049fd0f3d0e49109e778edc10de9426005cb
+      url: "https://pub.dev"
+    source: hosted
+    version: "8.9.2"
   characters:
     dependency: transitive
     description:
@@ -73,6 +145,14 @@ packages:
       url: "https://pub.dev"
     source: hosted
     version: "1.3.1"
+  checked_yaml:
+    dependency: transitive
+    description:
+      name: checked_yaml
+      sha256: feb6bed21949061731a7a75fc5d2aa727cf160b91af9a3e464c5e3a32e28b5ff
+      url: "https://pub.dev"
+    source: hosted
+    version: "2.0.3"
   clock:
     dependency: transitive
     description:
@@ -81,6 +161,14 @@ packages:
       url: "https://pub.dev"
     source: hosted
     version: "1.1.1"
+  code_builder:
+    dependency: transitive
+    description:
+      name: code_builder
+      sha256: f692079e25e7869c14132d39f223f8eec9830eb76131925143b2129c4bb01b37
+      url: "https://pub.dev"
+    source: hosted
+    version: "4.10.0"
   collection:
     dependency: "direct main"
     description:
@@ -89,6 +177,14 @@ packages:
       url: "https://pub.dev"
     source: hosted
     version: "1.18.0"
+  convert:
+    dependency: transitive
+    description:
+      name: convert
+      sha256: "0f08b14755d163f6e2134cb58222dd25ea2a2ee8a195e53983d57c075324d592"
+      url: "https://pub.dev"
+    source: hosted
+    version: "3.1.1"
   cross_file:
     dependency: transitive
     description:
@@ -121,6 +217,14 @@ packages:
       url: "https://pub.dev"
     source: hosted
     version: "1.0.6"
+  dart_style:
+    dependency: transitive
+    description:
+      name: dart_style
+      sha256: "1efa911ca7086affd35f463ca2fc1799584fb6aa89883cf0af8e3664d6a02d55"
+      url: "https://pub.dev"
+    source: hosted
+    version: "2.3.2"
   dartz:
     dependency: "direct main"
     description:
@@ -185,6 +289,14 @@ packages:
       url: "https://pub.dev"
     source: hosted
     version: "6.1.4"
+  fixnum:
+    dependency: transitive
+    description:
+      name: fixnum
+      sha256: "25517a4deb0c03aa0f32fd12db525856438902d9c16536311e76cdc57b31d7d1"
+      url: "https://pub.dev"
+    source: hosted
+    version: "1.1.0"
   fk_user_agent:
     dependency: "direct main"
     description:
@@ -392,6 +504,14 @@ packages:
     description: flutter
     source: sdk
     version: "0.0.0"
+  frontend_server_client:
+    dependency: transitive
+    description:
+      name: frontend_server_client
+      sha256: "408e3ca148b31c20282ad6f37ebfa6f4bdc8fede5b74bc2f08d9d92b55db3612"
+      url: "https://pub.dev"
+    source: hosted
+    version: "3.2.0"
   get:
     dependency: "direct main"
     description:
@@ -400,6 +520,22 @@ packages:
       url: "https://pub.dev"
     source: hosted
     version: "4.6.6"
+  glob:
+    dependency: transitive
+    description:
+      name: glob
+      sha256: "0e7014b3b7d4dac1ca4d6114f82bf1782ee86745b9b42a92c9289c23d8a0ab63"
+      url: "https://pub.dev"
+    source: hosted
+    version: "2.1.2"
+  graphs:
+    dependency: transitive
+    description:
+      name: graphs
+      sha256: "741bbf84165310a68ff28fe9e727332eef1407342fca52759cb21ad8177bb8d0"
+      url: "https://pub.dev"
+    source: hosted
+    version: "2.3.2"
   html:
     dependency: "direct main"
     description:
@@ -416,6 +552,14 @@ packages:
       url: "https://pub.dev"
     source: hosted
     version: "1.1.0"
+  http_multi_server:
+    dependency: transitive
+    description:
+      name: http_multi_server
+      sha256: "97486f20f9c2f7be8f514851703d0119c3596d14ea63227af6f7a481ef2b2f8b"
+      url: "https://pub.dev"
+    source: hosted
+    version: "3.2.1"
   http_parser:
     dependency: "direct main"
     description:
@@ -440,6 +584,14 @@ packages:
       url: "https://pub.dev"
     source: hosted
     version: "0.19.0"
+  io:
+    dependency: transitive
+    description:
+      name: io
+      sha256: "2ec25704aba361659e10e3e5f5d672068d332fc8ac516421d483a11e5cbd061e"
+      url: "https://pub.dev"
+    source: hosted
+    version: "1.0.4"
   js:
     dependency: transitive
     description:
@@ -448,6 +600,14 @@ packages:
       url: "https://pub.dev"
     source: hosted
     version: "0.6.7"
+  json_annotation:
+    dependency: transitive
+    description:
+      name: json_annotation
+      sha256: "1ce844379ca14835a50d2f019a3099f419082cfdd231cd86a142af94dd5c6bb1"
+      url: "https://pub.dev"
+    source: hosted
+    version: "4.9.0"
   leak_tracker:
     dependency: transitive
     description:
@@ -488,6 +648,14 @@ packages:
       url: "https://pub.dev"
     source: hosted
     version: "2.1.1"
+  logging:
+    dependency: transitive
+    description:
+      name: logging
+      sha256: "623a88c9594aa774443aa3eb2d41807a48486b5613e67599fb4c41c0ad47c340"
+      url: "https://pub.dev"
+    source: hosted
+    version: "1.2.0"
   matcher:
     dependency: transitive
     description:
@@ -512,6 +680,30 @@ packages:
       url: "https://pub.dev"
     source: hosted
     version: "1.12.0"
+  mime:
+    dependency: transitive
+    description:
+      name: mime
+      sha256: "2e123074287cc9fd6c09de8336dae606d1ddb88d9ac47358826db698c176a1f2"
+      url: "https://pub.dev"
+    source: hosted
+    version: "1.0.5"
+  mockito:
+    dependency: "direct dev"
+    description:
+      name: mockito
+      sha256: "6841eed20a7befac0ce07df8116c8b8233ed1f4486a7647c7fc5a02ae6163917"
+      url: "https://pub.dev"
+    source: hosted
+    version: "5.4.4"
+  package_config:
+    dependency: transitive
+    description:
+      name: package_config
+      sha256: "1c5b77ccc91e4823a5af61ee74e6b972db1ef98c2ff5a18d3161c982a55448bd"
+      url: "https://pub.dev"
+    source: hosted
+    version: "2.1.0"
   package_info_plus:
     dependency: "direct main"
     description:
@@ -664,6 +856,14 @@ packages:
       url: "https://pub.dev"
     source: hosted
     version: "0.10.1+2"
+  pool:
+    dependency: transitive
+    description:
+      name: pool
+      sha256: "20fe868b6314b322ea036ba325e6fc0711a22948856475e2c2b6306e8ab39c2a"
+      url: "https://pub.dev"
+    source: hosted
+    version: "1.5.1"
   printing:
     dependency: "direct main"
     description:
@@ -672,6 +872,22 @@ packages:
       url: "https://pub.dev"
     source: hosted
     version: "5.12.0"
+  pub_semver:
+    dependency: transitive
+    description:
+      name: pub_semver
+      sha256: "40d3ab1bbd474c4c2328c91e3a7df8c6dd629b79ece4c4bd04bee496a224fb0c"
+      url: "https://pub.dev"
+    source: hosted
+    version: "2.1.4"
+  pubspec_parse:
+    dependency: transitive
+    description:
+      name: pubspec_parse
+      sha256: c799b721d79eb6ee6fa56f00c04b472dcd44a30d258fac2174a6ec57302678f8
+      url: "https://pub.dev"
+    source: hosted
+    version: "1.3.0"
   qr:
     dependency: transitive
     description:
@@ -680,11 +896,35 @@ packages:
       url: "https://pub.dev"
     source: hosted
     version: "3.0.1"
+  shelf:
+    dependency: transitive
+    description:
+      name: shelf
+      sha256: ad29c505aee705f41a4d8963641f91ac4cee3c8fad5947e033390a7bd8180fa4
+      url: "https://pub.dev"
+    source: hosted
+    version: "1.4.1"
+  shelf_web_socket:
+    dependency: transitive
+    description:
+      name: shelf_web_socket
+      sha256: "9ca081be41c60190ebcb4766b2486a7d50261db7bd0f5d9615f2d653637a84c1"
+      url: "https://pub.dev"
+    source: hosted
+    version: "1.0.4"
   sky_engine:
     dependency: transitive
     description: flutter
     source: sdk
     version: "0.0.99"
+  source_gen:
+    dependency: transitive
+    description:
+      name: source_gen
+      sha256: "14658ba5f669685cd3d63701d01b31ea748310f7ab854e471962670abcf57832"
+      url: "https://pub.dev"
+    source: hosted
+    version: "1.5.0"
   source_span:
     dependency: transitive
     description:
@@ -709,6 +949,14 @@ packages:
       url: "https://pub.dev"
     source: hosted
     version: "2.1.2"
+  stream_transform:
+    dependency: transitive
+    description:
+      name: stream_transform
+      sha256: "14a00e794c7c11aa145a170587321aedce29769c08d7f58b1d141da75e3b1c6f"
+      url: "https://pub.dev"
+    source: hosted
+    version: "2.1.0"
   string_scanner:
     dependency: transitive
     description:
@@ -733,6 +981,14 @@ packages:
       url: "https://pub.dev"
     source: hosted
     version: "0.7.0"
+  timing:
+    dependency: transitive
+    description:
+      name: timing
+      sha256: "70a3b636575d4163c477e6de42f247a23b315ae20e86442bebe32d3cabf61c32"
+      url: "https://pub.dev"
+    source: hosted
+    version: "1.0.1"
   typed_data:
     dependency: transitive
     description:
@@ -861,6 +1117,14 @@ packages:
       url: "https://pub.dev"
     source: hosted
     version: "14.2.1"
+  watcher:
+    dependency: transitive
+    description:
+      name: watcher
+      sha256: "3d2ad6751b3c16cf07c7fca317a1413b3f26530319181b37e3b9039b84fc01d8"
+      url: "https://pub.dev"
+    source: hosted
+    version: "1.1.0"
   web:
     dependency: transitive
     description:
@@ -869,6 +1133,14 @@ packages:
       url: "https://pub.dev"
     source: hosted
     version: "0.3.0"
+  web_socket_channel:
+    dependency: transitive
+    description:
+      name: web_socket_channel
+      sha256: d88238e5eac9a42bb43ca4e721edba3c08c6354d4a53063afaa568516217621b
+      url: "https://pub.dev"
+    source: hosted
+    version: "2.4.0"
   win32:
     dependency: transitive
     description:
@@ -893,6 +1165,14 @@ packages:
       url: "https://pub.dev"
     source: hosted
     version: "6.4.2"
+  yaml:
+    dependency: transitive
+    description:
+      name: yaml
+      sha256: "75769501ea3489fca56601ff33454fe45507ea3bfb014161abc3b43ae25989d5"
+      url: "https://pub.dev"
+    source: hosted
+    version: "3.1.2"
 sdks:
-  dart: ">=3.3.0 <4.0.0"
+  dart: ">=3.4.0 <4.0.0"
   flutter: ">=3.20.0-7.0.pre.48"
diff --git a/core/pubspec.yaml b/core/pubspec.yaml
index 619295679..53f3d8390 100644
--- a/core/pubspec.yaml
+++ b/core/pubspec.yaml
@@ -88,6 +88,10 @@ dev_dependencies:
   path_provider_platform_interface: 2.1.1
 
   plugin_platform_interface: 2.1.8
+
+  build_runner: 2.3.3
+
+  mockito:  5.4.4
 # For information on the generic Dart part of this file, see the
 # following page: https://dart.dev/tools/pub/pubspec
 
diff --git a/core/test/utils/application_manager_test.dart b/core/test/utils/application_manager_test.dart
new file mode 100644
index 000000000..5eddbd545
--- /dev/null
+++ b/core/test/utils/application_manager_test.dart
@@ -0,0 +1,131 @@
+import 'package:core/utils/application_manager.dart';
+import 'package:core/utils/platform_info.dart';
+import 'package:device_info_plus/device_info_plus.dart';
+import 'package:fk_user_agent/fk_user_agent.dart';
+import 'package:flutter/foundation.dart';
+import 'package:flutter/services.dart';
+import 'package:flutter_test/flutter_test.dart';
+import 'package:mockito/annotations.dart';
+import 'package:mockito/mockito.dart';
+
+import 'application_manager_test.mocks.dart';
+
+@GenerateNiceMocks([
+  MockSpec<DeviceInfoPlugin>()
+])
+void main() {
+  TestWidgetsFlutterBinding.ensureInitialized();
+
+  late MockDeviceInfoPlugin mockDeviceInfoPlugin;
+  late ApplicationManager applicationManager;
+
+  setUp(() {
+    mockDeviceInfoPlugin = MockDeviceInfoPlugin();
+    applicationManager = ApplicationManager(mockDeviceInfoPlugin);
+  });
+
+  group('ApplicationManager::getUserAgent test', () {
+    test('WHEN platform is Web THEN getUserAgent should be return user agent for web', () async {
+      const webUserAgent = 'User-Agent-Twake-Mail-Web';
+
+      PlatformInfo.isTestingForWeb = true;
+
+      when(mockDeviceInfoPlugin.webBrowserInfo)
+          .thenAnswer((_) async => WebBrowserInfo(
+                userAgent: webUserAgent,
+                appCodeName: '',
+                appName: '',
+                appVersion: '',
+                deviceMemory: null,
+                language: '',
+                languages: [],
+                platform: '',
+                product: '',
+                productSub: '',
+                vendor: '',
+                vendorSub: '',
+                maxTouchPoints: null,
+                hardwareConcurrency: null,
+              ));
+
+      final userAgent = await applicationManager.getUserAgent();
+
+      expect(userAgent, webUserAgent);
+
+      PlatformInfo.isTestingForWeb = false;
+    });
+
+    test('WHEN platform is Android THEN getUserAgent should be return user agent for Android', () async {
+      debugDefaultTargetPlatformOverride = TargetPlatform.android;
+
+      const androidUserAgent = 'User-Agent-Twake-Mail-Android';
+
+      TestDefaultBinaryMessengerBinding.instance.defaultBinaryMessenger.setMockMethodCallHandler(
+        const MethodChannel('fk_user_agent'),
+        (message) async {
+          if (message.method == 'getProperties') {
+            return {
+              'userAgent': androidUserAgent
+            };
+          }
+          return null;
+        }
+      );
+
+      await FkUserAgent.init();
+
+      final userAgent = await applicationManager.getUserAgent();
+
+      expect(userAgent, androidUserAgent);
+
+      debugDefaultTargetPlatformOverride = null;
+      FkUserAgent.release();
+      TestDefaultBinaryMessengerBinding.instance.defaultBinaryMessenger.setMockMethodCallHandler(
+        const MethodChannel('fk_user_agent'),
+        null);
+    });
+
+    test('WHEN platform is Web\n'
+        'AND mockDeviceInfoPlugin.webBrowserInfo throw exception\n'
+        'THEN getUserAgent should be return empty string',
+    () async {
+      PlatformInfo.isTestingForWeb = true;
+
+      when(mockDeviceInfoPlugin.webBrowserInfo).thenThrow(Exception('Failed to get web browser info'));
+
+      final userAgent = await applicationManager.getUserAgent();
+
+      expect(userAgent, '');
+
+      PlatformInfo.isTestingForWeb = false;
+    });
+
+    test('WHEN platform is Android\n'
+        'AND FkUserAgent.userAgent return empty string\n'
+        'THEN getUserAgent should be return empty string',
+    () async {
+      debugDefaultTargetPlatformOverride = TargetPlatform.android;
+      TestDefaultBinaryMessengerBinding.instance.defaultBinaryMessenger.setMockMethodCallHandler(
+        const MethodChannel('fk_user_agent'),
+        (message) async {
+          if (message.method == 'getProperties') {
+            return {};
+          }
+          return null;
+        }
+      );
+
+      await FkUserAgent.init();
+
+      final userAgent = await applicationManager.getUserAgent();
+
+      expect(userAgent, '');
+
+      debugDefaultTargetPlatformOverride = null;
+      FkUserAgent.release();
+      TestDefaultBinaryMessengerBinding.instance.defaultBinaryMessenger.setMockMethodCallHandler(
+        const MethodChannel('fk_user_agent'),
+        null);
+    });
+  });
+}
diff --git a/scripts/prebuild.sh b/scripts/prebuild.sh
index 0b2a7b121..5104c75d6 100755
--- a/scripts/prebuild.sh
+++ b/scripts/prebuild.sh
@@ -5,7 +5,7 @@ set -e
 set -x
 
 cd core
-flutter pub get
+flutter pub get && dart run build_runner build --delete-conflicting-outputs
 
 ## Install necessary pods
 # cd ../ios