pull refresh on session screen

lib/data/session/session_service.dart

@@ -382,6 +382,50 @@ class SessionService {
     await _loadPreferredRelaysIfAvailable();
   }
 
+  /// Refreshes the current user's Nostr profile and preferred relays.
+  /// 
+  /// Re-fetches the profile from relays and reloads preferred relays from NIP-05.
+  /// 
+  /// Throws [SessionException] if refresh fails or if no user is logged in.
+  Future<void> refreshNostrProfile() async {
+    if (_currentUser == null) {
+      throw SessionException('No user logged in.');
+    }
+
+    if (_nostrService == null) {
+      throw SessionException('Nostr service not available');
+    }
+
+    // Only refresh if user has Nostr profile (logged in with Nostr)
+    if (_currentUser!.nostrProfile == null && _currentUser!.nostrPrivateKey == null) {
+      throw SessionException('User is not logged in with Nostr');
+    }
+
+    try {
+      // Re-fetch profile from relays
+      NostrProfile? profile;
+      try {
+        profile = await _nostrService!.fetchProfile(_currentUser!.id);
+      } catch (e) {
+        debugPrint('Warning: Failed to refresh Nostr profile: $e');
+        // Continue without profile update - offline-first behavior
+      }
+
+      // Update user with refreshed profile
+      if (profile != null) {
+        _currentUser = _currentUser!.copyWith(nostrProfile: profile);
+      }
+
+      // Reload preferred relays from NIP-05 if available
+      await _loadPreferredRelaysIfAvailable();
+    } catch (e) {
+      if (e is SessionException) {
+        rethrow;
+      }
+      throw SessionException('Failed to refresh Nostr profile: $e');
+    }
+  }
+
   /// Internal method to load preferred relays from NIP-05 if available.
   Future<void> _loadPreferredRelaysIfAvailable() async {
     if (_currentUser == null || _nostrService == null) {