Change PIN to 1451

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

apps/captain-mobile-v2/flutter/lib/models/conversation.dart

@@ -0,0 +1,38 @@
+class Conversation {
+  final String id;
+  final String? title;
+  final DateTime createdAt;
+  final DateTime updatedAt;
+  final int messageCount;
+
+  Conversation({
+    required this.id,
+    this.title,
+    required this.createdAt,
+    required this.updatedAt,
+    this.messageCount = 0,
+  });
+
+  factory Conversation.fromJson(Map<String, dynamic> json) {
+    return Conversation(
+      id: json['id'],
+      title: json['title'],
+      createdAt: DateTime.parse(json['created_at']),
+      updatedAt: DateTime.parse(json['updated_at']),
+      messageCount: json['message_count'] ?? 0,
+    );
+  }
+
+  String get displayTitle => title ?? 'New Conversation';
+
+  String get timeAgo {
+    final now = DateTime.now();
+    final diff = now.difference(updatedAt);
+
+    if (diff.inMinutes < 1) return 'Just now';
+    if (diff.inMinutes < 60) return '${diff.inMinutes}m ago';
+    if (diff.inHours < 24) return '${diff.inHours}h ago';
+    if (diff.inDays < 7) return '${diff.inDays}d ago';
+    return '${updatedAt.day}/${updatedAt.month}/${updatedAt.year}';
+  }
+}