Add message filters and counts

lib/providers/messages_provider.dart

@@ -193,6 +193,59 @@ class MessagesProvider with ChangeNotifier {
       .where((m) => !m.isRead && !m.isSentMessage && !m.isSystemMessage)
       .length;
 
+  int getMessageCountForDestination(Contact contact) => _messages
+      .where((message) => _isMessageForDestination(message, contact))
+      .length;
+
+  int getUnreadCountForDestination(Contact contact) => _messages
+      .where(
+        (message) =>
+            _isMessageForDestination(message, contact) &&
+            !message.isRead &&
+            !message.isSentMessage &&
+            !message.isSystemMessage,
+      )
+      .length;
+
+  bool _isMessageForDestination(Message message, Contact contact) {
+    if (message.isSystemMessage) return false;
+
+    if (contact.isChannel) {
+      final channelIdx = contact.publicKey.length > 1
+          ? contact.publicKey[1]
+          : 0;
+      return message.isChannelMessage &&
+          (message.channelIdx ?? 0) == channelIdx;
+    }
+
+    if (!message.isContactMessage || contact.publicKey.length < 6) {
+      return false;
+    }
+
+    final selectedPrefix = contact.publicKey.sublist(0, 6);
+
+    if (message.recipientPublicKey != null &&
+        message.recipientPublicKey!.length >= 6 &&
+        _matchesPrefix(message.recipientPublicKey!, selectedPrefix)) {
+      return true;
+    }
+
+    if (message.senderPublicKeyPrefix != null &&
+        message.senderPublicKeyPrefix!.length >= 6 &&
+        _matchesPrefix(message.senderPublicKeyPrefix!, selectedPrefix)) {
+      return true;
+    }
+
+    return false;
+  }
+
+  bool _matchesPrefix(Uint8List key, Uint8List prefix) {
+    for (var i = 0; i < 6; i++) {
+      if (key[i] != prefix[i]) return false;
+    }
+    return true;
+  }
+
   /// Initialize and load persisted messages
   Future<void> initialize() async {
     if (_isInitialized) return;

lib/screens/contacts_tab.dart

@@ -7,6 +7,7 @@ import '../models/contact.dart';
 import '../providers/contacts_provider.dart';
 import '../providers/app_provider.dart';
 import '../providers/connection_provider.dart';
+import '../providers/messages_provider.dart';
 import '../widgets/contacts/contact_tile.dart';
 import '../widgets/contacts/add_channel_dialog.dart';
 
@@ -201,8 +202,8 @@ class _ContactsTabState extends State<ContactsTab> {
     final l10n = AppLocalizations.of(context)!;
 
     return Scaffold(
-      body: Consumer<ContactsProvider>(
+      body: Consumer2<ContactsProvider, MessagesProvider>(
-        builder: (context, contactsProvider, child) {
+        builder: (context, contactsProvider, messagesProvider, child) {
           final chatContacts = _sortContactsByDistance(
             contactsProvider.chatContacts,
           );
@@ -284,6 +285,10 @@ class _ContactsTabState extends State<ContactsTab> {
                       calculateDistance: _calculateDistanceInMeters,
                       formatDistance: _formatDistance,
                       onNavigateToMap: widget.onNavigateToMap,
+                      messageCount: messagesProvider
+                          .getMessageCountForDestination(contact),
+                      unreadMessageCount: messagesProvider
+                          .getUnreadCountForDestination(contact),
                     ),
                   ),
                   const Divider(height: 32),
@@ -303,6 +308,10 @@ class _ContactsTabState extends State<ContactsTab> {
                       calculateDistance: _calculateDistanceInMeters,
                       formatDistance: _formatDistance,
                       onNavigateToMap: widget.onNavigateToMap,
+                      messageCount: messagesProvider
+                          .getMessageCountForDestination(contact),
+                      unreadMessageCount: messagesProvider
+                          .getUnreadCountForDestination(contact),
                     ),
                   ),
                   const Divider(height: 32),
@@ -322,6 +331,10 @@ class _ContactsTabState extends State<ContactsTab> {
                       calculateDistance: _calculateDistanceInMeters,
                       formatDistance: _formatDistance,
                       onNavigateToMap: widget.onNavigateToMap,
+                      messageCount: messagesProvider
+                          .getMessageCountForDestination(contact),
+                      unreadMessageCount: messagesProvider
+                          .getUnreadCountForDestination(contact),
                     ),
                   ),
                   const Divider(height: 32),
@@ -341,6 +354,10 @@ class _ContactsTabState extends State<ContactsTab> {
                       calculateDistance: _calculateDistanceInMeters,
                       formatDistance: _formatDistance,
                       onNavigateToMap: widget.onNavigateToMap,
+                      messageCount: messagesProvider
+                          .getMessageCountForDestination(contact),
+                      unreadMessageCount: messagesProvider
+                          .getUnreadCountForDestination(contact),
                     ),
                   ),
                 ],

lib/widgets/contacts/contact_tile.dart

@@ -21,6 +21,8 @@ class ContactTile extends StatelessWidget {
   final double Function(double, double, double, double)? calculateDistance;
   final String Function(double)? formatDistance;
   final VoidCallback? onNavigateToMap;
+  final int messageCount;
+  final int unreadMessageCount;
 
   const ContactTile({
     super.key,
@@ -29,6 +31,8 @@ class ContactTile extends StatelessWidget {
     this.calculateDistance,
     this.formatDistance,
     this.onNavigateToMap,
+    this.messageCount = 0,
+    this.unreadMessageCount = 0,
   });
 
   /// Get localized time since last seen
@@ -263,6 +267,13 @@ class ContactTile extends StatelessWidget {
                               ],
                             ),
                           ),
+                          if (messageCount > 0) ...[
+                            const SizedBox(width: 8),
+                            _MessageCountBadge(
+                              totalCount: messageCount,
+                              unreadCount: unreadMessageCount,
+                            ),
+                          ],
                           const SizedBox(width: 8),
                           Text(timeAgoText, style: timeAgoStyle),
                           if (isPingInProgress) ...[
@@ -1301,3 +1312,59 @@ class ContactTile extends StatelessWidget {
     );
   }
 }
+
+class _MessageCountBadge extends StatelessWidget {
+  final int totalCount;
+  final int unreadCount;
+
+  const _MessageCountBadge({
+    required this.totalCount,
+    required this.unreadCount,
+  });
+
+  @override
+  Widget build(BuildContext context) {
+    final colorScheme = Theme.of(context).colorScheme;
+    final hasUnread = unreadCount > 0;
+
+    return Container(
+      padding: const EdgeInsets.symmetric(horizontal: 8, vertical: 4),
+      decoration: BoxDecoration(
+        color: hasUnread
+            ? colorScheme.primaryContainer
+            : colorScheme.surfaceContainerHighest,
+        borderRadius: BorderRadius.circular(999),
+        border: Border.all(
+          color: hasUnread
+              ? colorScheme.primary.withValues(alpha: 0.35)
+              : colorScheme.outlineVariant.withValues(alpha: 0.45),
+        ),
+      ),
+      child: Row(
+        mainAxisSize: MainAxisSize.min,
+        children: [
+          if (hasUnread) ...[
+            Container(
+              width: 6,
+              height: 6,
+              decoration: BoxDecoration(
+                color: colorScheme.primary,
+                shape: BoxShape.circle,
+              ),
+            ),
+            const SizedBox(width: 5),
+          ],
+          Text(
+            hasUnread ? '$unreadCount/$totalCount' : '$totalCount',
+            style: Theme.of(context).textTheme.labelSmall?.copyWith(
+              color: hasUnread
+                  ? colorScheme.onPrimaryContainer
+                  : colorScheme.onSurfaceVariant,
+              fontWeight: FontWeight.w800,
+            ),
+          ),
+        ],
+      ),
+    );
+  }
+}