refactor: enhance stealth mode handling and clean up imports across services

dialer/lib/core/config/app_config.dart

@@ -9,5 +9,6 @@ class AppConfig {
   static Future<void> initialize() async {
     const stealthFlag = String.fromEnvironment('STEALTH', defaultValue: 'false');
     isStealthMode = stealthFlag.toLowerCase() == 'true';
+    print('Stealth mode is ${isStealthMode ? 'enabled' : 'disabled'}');
   }
 }

dialer/lib/domain/services/obfuscate_service.dart

@@ -1,7 +1,7 @@
 // lib/services/obfuscate_service.dart
 import 'package:dialer/widgets/color_darkener.dart';
 
-import '../../globals.dart' as globals;
+import '../../core/config/app_config.dart';
 import 'dart:ui';
 import 'dart:typed_data';
 import 'package:flutter/material.dart';
@@ -20,7 +20,7 @@ class ObfuscateService {
 
   // Public method to obfuscate data
   String obfuscateData(String data) {
-    if (globals.isStealthMode) {
+    if (AppConfig.isStealthMode) {
       return _obfuscateData(data);
     } else {
       return data;
@@ -61,7 +61,7 @@ class ObfuscatedAvatar extends StatelessWidget {
     if (imageBytes != null && imageBytes!.isNotEmpty) {
       return ClipOval(
         child: ImageFiltered(
-          imageFilter: globals.isStealthMode
+          imageFilter: AppConfig.isStealthMode
               ? ImageFilter.blur(sigmaX: 10, sigmaY: 10)
               : ImageFilter.blur(sigmaX: 0, sigmaY: 0),
           child: Image.memory(

dialer/lib/globals.dart

@@ -1,5 +1,7 @@
 // Global variables accessible throughout the app
 library globals;
 
+import 'core/config/app_config.dart';
+
 // Whether the app is in stealth mode (obfuscated content)
-bool isStealthMode = false;
+bool get isStealthMode => AppConfig.isStealthMode;

dialer/lib/presentation/features/composition/composition.dart

@@ -1,7 +1,7 @@
 import 'package:flutter/material.dart';
 import 'package:flutter_contacts/flutter_contacts.dart';
 import 'package:url_launcher/url_launcher.dart';
-import '../../../services/contact_service.dart';
+import '../../../domain/services/contact_service.dart';
 import '../../../domain/services/obfuscate_service.dart';
 import '../../../domain/services/call_service.dart';
 import '../contacts/widgets/add_contact_button.dart';

dialer/lib/presentation/features/contacts/contact_page.dart

@@ -1,6 +1,8 @@
 import 'package:flutter/material.dart';
 import '../contacts/contact_state.dart';
 import '../contacts/widgets/alphabet_scroll_page.dart';
+import '../../common/widgets/loading_indicator.dart';
+import '../../../domain/services/obfuscate_service.dart';
 
 class ContactPage extends StatefulWidget {
   const ContactPage({super.key});
@@ -10,6 +12,8 @@ class ContactPage extends StatefulWidget {
 }
 
 class _ContactPageState extends State<ContactPage> {
+  final ObfuscateService _obfuscateService = ObfuscateService();
+
   @override
   Widget build(BuildContext context) {
     final contactState = ContactState.of(context);