fix(contacts): validate duplicate phone numbers before adding

modules/legacy/modules/device_management/lib/src/features/contacts/presentation/contacts_screen.dart

@@ -112,7 +112,7 @@ class ContactsScreen extends ConsumerWidget {
               return;
             }
             if (!context.mounted) return;
-            showDialog<void>(
+            showLegacyDialog<void>(
               context: context,
               builder: (_) => Dialog(
                 backgroundColor: Colors.transparent,
@@ -145,7 +145,7 @@ class ContactsScreen extends ConsumerWidget {
     required String contactId,
     required int currentCount,
   }) async {
-    final confirmed = await showDialog<bool>(
+    final confirmed = await showLegacyDialog<bool>(
       context: context,
       builder: (dialogContext) => AlertDialog(
         title: Text(context.translate(I18n.deleteContactMessage)),

modules/legacy/modules/device_management/lib/src/features/contacts/presentation/widgets/new_contact_dialog.dart

@@ -1,5 +1,6 @@
 import 'package:design_system/design_system.dart';
 import 'package:device_management/src/features/contacts/presentation/providers/contacts_controller.dart';
+import 'package:device_management/src/features/contacts/presentation/providers/contacts_provider.dart';
 import 'package:device_management/src/features/contacts/presentation/providers/new_contact_form_provider.dart';
 import 'package:flutter/material.dart';
 import 'package:flutter_riverpod/flutter_riverpod.dart';
@@ -99,6 +100,16 @@ class _NewContactDialogState extends ConsumerState<NewContactDialog> {
       return;
     }
 
+    final existingContacts =
+        ref.read(contactsProvider(widget.userId)).value ?? [];
+    final isDuplicate = existingContacts.any(
+      (c) => c.phone?.e164 == parsed.e164 || c.rawPhone == parsed.e164,
+    );
+    if (isDuplicate) {
+      formNotifier.setLocalError(I18n.errorContactDuplicate);
+      return;
+    }
+
     formNotifier.clearError();
     Navigator.of(context).pop();
     ref.read(contactsControllerProvider.notifier).createContact(

modules/legacy/modules/settings/lib/src/features/block_phone/presentation/widgets/add_contact_sheet.dart

@@ -162,6 +162,16 @@ class _ContactFormSheetWrapperState
       return;
     }
 
+    if (!_isEdit) {
+      final isDuplicate = widget.currentContacts.any(
+        (c) => c.phone == parsed.e164,
+      );
+      if (isDuplicate) {
+        formNotifier.setPhoneError(I18n.errorContactDuplicate);
+        return;
+      }
+    }
+
     final contact = ContactListContactEntity(
       name: _nameController.text.trim(),
       phone: parsed.e164,

modules/legacy/modules/settings/lib/src/features/sos_contacts/presentation/sos_contacts_screen.dart

@@ -1,3 +1,4 @@
+import 'package:legacy_ui/legacy_ui.dart';
 import 'package:design_system/design_system.dart';
 import 'package:flutter/material.dart';
 import 'package:flutter_riverpod/flutter_riverpod.dart';
@@ -21,8 +22,8 @@ class SosContactsScreen extends ConsumerWidget {
   Widget build(BuildContext context, WidgetRef ref) {
     final device = ref.watch(selectedDeviceProvider).value;
     final primaryColor = context.sfColors.legacyPrimary;
-    final maxContacts = device?.capabilities?.contacts
-            ?.maxForType('emergency', fallback: 3) ??
+    final maxContacts =
+        device?.capabilities?.contacts?.maxForType('emergency', fallback: 3) ??
         3;
 
     ref.listen(sosContactsControllerProvider, (prev, next) async {
@@ -128,7 +129,7 @@ class SosContactsScreen extends ConsumerWidget {
         ),
       ),
       title: Text(
-        context.translate(I18n.sosContacts).toUpperCase(),
+        context.translate(I18n.sosContacts),
         style: TextStyle(
           fontSize: SizeUtils.getByScreen(small: 20, big: 19),
           fontWeight: FontWeight.w500,
@@ -163,7 +164,7 @@ class SosContactsScreen extends ConsumerWidget {
 
   Future<bool?> _confirmDelete(BuildContext context, String name) {
     final theme = Theme.of(context);
-    return showDialog<bool>(
+    return showLegacyDialog<bool>(
       context: context,
       builder: (dialogContext) => AlertDialog(
         icon: Icon(
@@ -268,8 +269,7 @@ class _ContactList extends StatelessWidget {
                 context.translate(I18n.sosDescription),
                 style: TextStyle(
                   fontSize: SizeUtils.getByScreen(small: 14, big: 15),
-                  color:
-                      Theme.of(context).colorScheme.onSurface.withAlpha(178),
+                  color: Theme.of(context).colorScheme.onSurface.withAlpha(178),
                 ),
               ),
             ),

modules/legacy/modules/settings/lib/src/features/sos_contacts/presentation/widgets/add_sos_contact_sheet.dart

@@ -120,6 +120,14 @@ class _AddSosContactSheetState extends ConsumerState<_AddSosContactSheet> {
       return;
     }
 
+    final isDuplicate = widget.currentContacts.any(
+      (c) => c.phone == parsed.e164,
+    );
+    if (isDuplicate) {
+      formNotifier.setPhoneError(I18n.errorContactDuplicate);
+      return;
+    }
+
     await ref.read(sosContactsControllerProvider.notifier).addContact(
           deviceId: widget.deviceId,
           userId: widget.userId,