feat: implement privacy mode to mask contact names and phone numbers

dialer/lib/features/contacts/contact_page.dart

@@ -2,6 +2,39 @@ import 'package:dialer/features/contacts/contact_state.dart';
 import 'package:dialer/features/contacts/widgets/alphabet_scroll_page.dart';
 import 'package:flutter/material.dart';
 import 'package:dialer/widgets/loading_indicator.dart';
+import 'package:flutter_contacts/flutter_contacts.dart';
+
+const bool _privacyMode = bool.fromEnvironment('privacy-mode', defaultValue: false);
+
+List<Contact> _maskContacts(List<Contact> original) {
+  if (!_privacyMode) return original;
+  return original.map((c) {
+    final maskedName = _maskName(c.displayName);
+    final phones = c.phones.map((p) => Phone(
+      _maskPhone(p.number),
+      label: p.label,
+    )).toList();
+    final masked = Contact()
+      ..displayName = maskedName
+      ..thumbnail = c.thumbnail
+      ..phones = phones
+      ..id = c.id;
+    return masked;
+  }).toList();
+}
+
+String _maskName(String name) {
+  final parts = name.split(' ');
+  return parts.map((part) {
+    if (part.length < 2) return part;
+    return '${part[0]}${'*' * (part.length - 1)}';
+  }).join(' ');
+}
+
+String _maskPhone(String phone) {
+  if (phone.length < 3) return phone;
+  return phone.substring(0, 2) + '*' * (phone.length - 2);
+}
 
 class ContactPage extends StatefulWidget {
   const ContactPage({super.key});
@@ -19,7 +52,7 @@ class _ContactPageState extends State<ContactPage> {
           ? const LoadingIndicatorWidget()
           : AlphabetScrollPage(
               scrollOffset: contactState.scrollOffset,
-              contacts: contactState.contacts, // Use all contacts here
+              contacts: _maskContacts(contactState.contacts),
             ),
     );
   }

dialer/lib/features/favorites/favorites_page.dart

@@ -2,6 +2,39 @@ import 'package:dialer/features/contacts/contact_state.dart';
 import 'package:dialer/features/contacts/widgets/alphabet_scroll_page.dart';
 import 'package:flutter/material.dart';
 import 'package:dialer/widgets/loading_indicator.dart';
+import 'package:flutter_contacts/flutter_contacts.dart';
+
+const bool _privacyMode = bool.fromEnvironment('privacy-mode', defaultValue: false);
+
+List<Contact> _maskContacts(List<Contact> original) {
+  if (!_privacyMode) return original;
+  return original.map((c) {
+    final maskedName = _maskName(c.displayName);
+    final phones = c.phones.map((p) => Phone(
+      _maskPhone(p.number),
+      label: p.label,
+    )).toList();
+    final masked = Contact()
+      ..displayName = maskedName
+      ..thumbnail = c.thumbnail
+      ..phones = phones
+      ..id = c.id;
+    return masked;
+  }).toList();
+}
+
+String _maskName(String name) {
+  final parts = name.split(' ');
+  return parts.map((part) {
+    if (part.length < 2) return part;
+    return '${part[0]}${'*' * (part.length - 1)}';
+  }).join(' ');
+}
+
+String _maskPhone(String phone) {
+  if (phone.length < 3) return phone;
+  return phone.substring(0, 2) + '*' * (phone.length - 2);
+}
 
 class FavoritesPage extends StatefulWidget {
   const FavoritesPage({super.key});
@@ -24,8 +57,7 @@ class _FavoritesPageState extends State<FavoritesPage> {
           ? const LoadingIndicatorWidget()
           : AlphabetScrollPage(
               scrollOffset: contactState.scrollOffset,
-              contacts:
-                  contactState.favoriteContacts, // Use only favorites here
+              contacts: _maskContacts(contactState.favoriteContacts),
             ),
     );
   }

dialer/lib/features/history/history_page.dart

@@ -22,6 +22,23 @@ class History {
       );
 }
 
+const bool _privacyMode = bool.fromEnvironment('privacy-mode', defaultValue: false);
+
+String _maskName(String name) {
+  if (!_privacyMode) return name;
+  final parts = name.split(' ');
+  return parts.map((part) {
+    if (part.length < 2) return part;
+    return '${part[0]}${'*' * (part.length - 1)}';
+  }).join(' ');
+}
+
+String _maskPhone(String phone) {
+  if (!_privacyMode) return phone;
+  if (phone.length < 3) return phone;
+  return phone.substring(0, 2) + '*' * (phone.length - 2);
+}
+
 class HistoryPage extends StatefulWidget {
   const HistoryPage({Key? key}) : super(key: key);
 
@@ -198,6 +215,7 @@ class _HistoryPageState extends State<HistoryPage> with SingleTickerProviderStat
         } else if (item is History) {
           final history = item;
           final contact = history.contact;
+          final maskedName = _maskName(contact.displayName);
           final isExpanded = _expandedIndex == index;
 
           // Generate the avatar color
@@ -213,14 +231,14 @@ class _HistoryPageState extends State<HistoryPage> with SingleTickerProviderStat
                     : CircleAvatar(
                   backgroundColor: avatarColor,
                   child: Text(
-                    contact.displayName.isNotEmpty
-                        ? contact.displayName[0].toUpperCase()
+                    maskedName.isNotEmpty
+                        ? maskedName[0]
                         : '?',
                     style: TextStyle(color: darken(avatarColor, 0.4)),
                   ),
                 ),
                 title: Text(
-                  contact.displayName,
+                  maskedName,
                   style: const TextStyle(color: Colors.white),
                 ),
                 subtitle: Text(
@@ -367,7 +385,7 @@ class CallDetailsPage extends StatelessWidget {
                 const SizedBox(width: 16),
                 Expanded(
                   child: Text(
-                    contact.displayName,
+                    _maskName(contact.displayName),
                     style: const TextStyle(color: Colors.white, fontSize: 24),
                   ),
                 ),
@@ -399,7 +417,7 @@ class CallDetailsPage extends StatelessWidget {
             if (contact.phones.isNotEmpty)
               DetailRow(
                 label: 'Number:',
-                value: contact.phones.first.number,
+                value: _maskPhone(contact.phones.first.number),
               ),
           ],
         ),

dialer/lib/features/home/home_page.dart

@@ -7,6 +7,17 @@ import 'package:flutter_contacts/flutter_contacts.dart';
 import 'package:dialer/features/settings/settings.dart';
 import '../../services/contact_service.dart';
 
+const bool _privacyMode = bool.fromEnvironment('privacy-mode', defaultValue: false);
+
+String _maskName(String name) {
+  if (!_privacyMode) return name;
+  final parts = name.split(' ');
+  return parts.map((part) {
+    if (part.length < 2) return part;
+    return '${part[0]}${'*' * (part.length - 1)}';
+  }).join(' ');
+}
+
 class _MyHomePageState extends State<MyHomePage>
     with SingleTickerProviderStateMixin {
   late TabController _tabController;
@@ -128,14 +139,7 @@ class _MyHomePageState extends State<MyHomePage>
                       suggestionsBuilder:
                           (BuildContext context, SearchController controller) {
                         return _contactSuggestions.map((contact) {
-                          return ListTile(
-                            key: ValueKey(contact.id),
-                            title: Text(contact.displayName,
-                                style: const TextStyle(color: Colors.white)),
-                            onTap: () {
-                              controller.closeView(contact.displayName);
-                            },
-                          );
+                          return _buildSuggestionTile(contact, controller);
                         }).toList();
                       },
                     ),
@@ -225,6 +229,17 @@ class _MyHomePageState extends State<MyHomePage>
       ),
     );
   }
+
+  Widget _buildSuggestionTile(Contact contact, SearchController controller) {
+    final maskedName = _maskName(contact.displayName);
+    return ListTile(
+      key: ValueKey(contact.id),
+      title: Text(maskedName, style: const TextStyle(color: Colors.white)),
+      onTap: () {
+        controller.closeView(maskedName);
+      },
+    );
+  }
 }
 
 class MyHomePage extends StatefulWidget {