nostr tools added

lib/data/session/models/user.dart

@@ -1,3 +1,5 @@
+import '../../nostr/models/nostr_profile.dart';
+
 /// Data model representing a user session.
 /// 
 /// This model stores user identification and authentication information
@@ -15,17 +17,22 @@ class User {
   /// Timestamp when the session was created (milliseconds since epoch).
   final int createdAt;
 
+  /// Optional Nostr profile data (if logged in via Nostr).
+  final NostrProfile? nostrProfile;
+
   /// Creates a [User] instance.
   /// 
   /// [id] - Unique identifier for the user.
   /// [username] - Display name or username.
   /// [token] - Optional authentication token.
   /// [createdAt] - Session creation timestamp (defaults to current time).
+  /// [nostrProfile] - Optional Nostr profile data.
   User({
     required this.id,
     required this.username,
     this.token,
     int? createdAt,
+    this.nostrProfile,
   }) : createdAt = createdAt ?? DateTime.now().millisecondsSinceEpoch;
 
   /// Creates a [User] from a Map (e.g., from database or JSON).
@@ -35,6 +42,9 @@ class User {
       username: map['username'] as String,
       token: map['token'] as String?,
       createdAt: map['created_at'] as int?,
+      nostrProfile: map['nostr_profile'] != null
+          ? NostrProfile.fromJson(map['nostr_profile'] as Map<String, dynamic>)
+          : null,
     );
   }
 
@@ -45,6 +55,7 @@ class User {
       'username': username,
       'token': token,
       'created_at': createdAt,
+      'nostr_profile': nostrProfile?.toJson(),
     };
   }
 
@@ -54,12 +65,14 @@ class User {
     String? username,
     String? token,
     int? createdAt,
+    NostrProfile? nostrProfile,
   }) {
     return User(
       id: id ?? this.id,
       username: username ?? this.username,
       token: token ?? this.token,
       createdAt: createdAt ?? this.createdAt,
+      nostrProfile: nostrProfile ?? this.nostrProfile,
     );
   }