mudular code ready to fork

lib/data/session/session_service.dart

@@ -1,7 +1,8 @@
 import 'dart:io';
-import 'package:flutter/foundation.dart';
 import 'package:path/path.dart' as path;
 import 'package:path_provider/path_provider.dart';
+import '../../core/logger.dart';
+import '../../core/exceptions/session_exception.dart';
 import '../local/local_storage_service.dart';
 import '../sync/sync_engine.dart';
 import '../firebase/firebase_service.dart';
@@ -10,18 +11,6 @@ import '../nostr/models/nostr_keypair.dart';
 import '../nostr/models/nostr_profile.dart';
 import 'models/user.dart';
 
-/// Exception thrown when session operations fail.
-class SessionException implements Exception {
-  /// Error message.
-  final String message;
-
-  /// Creates a [SessionException] with the provided message.
-  SessionException(this.message);
-
-  @override
-  String toString() => 'SessionException: $message';
-}
-
 /// Service for managing user sessions, login, logout, and session isolation.
 /// 
 /// This service provides:
@@ -124,7 +113,7 @@ class SessionService {
           await _firebaseService!.syncItemsFromFirestore(user.id);
         } catch (e) {
           // Log error but don't fail login - offline-first behavior
-          debugPrint('Warning: Failed to sync from Firebase on login: $e');
+          Logger.warning('Failed to sync from Firebase on login: $e');
         }
       }
 
@@ -174,7 +163,7 @@ class SessionService {
       try {
         profile = await _nostrService!.fetchProfile(keyPair.publicKey);
       } catch (e) {
-        debugPrint('Warning: Failed to fetch Nostr profile: $e');
+        Logger.warning('Failed to fetch Nostr profile: $e');
         // Continue without profile - offline-first behavior
       }
 
@@ -195,7 +184,7 @@ class SessionService {
           await _firebaseService!.syncItemsFromFirestore(user.id);
         } catch (e) {
           // Log error but don't fail login - offline-first behavior
-          debugPrint('Warning: Failed to sync from Firebase on login: $e');
+          Logger.warning('Failed to sync from Firebase on login: $e');
         }
       }
 
@@ -230,7 +219,7 @@ class SessionService {
           await _firebaseService!.syncItemsToFirestore(userId);
         } catch (e) {
           // Log error but don't fail logout - offline-first behavior
-          debugPrint('Warning: Failed to sync to Firebase on logout: $e');
+          Logger.warning('Failed to sync to Firebase on logout: $e');
         }
       }
 
@@ -407,7 +396,7 @@ class SessionService {
       try {
         profile = await _nostrService!.fetchProfile(_currentUser!.id);
       } catch (e) {
-        debugPrint('Warning: Failed to refresh Nostr profile: $e');
+        Logger.warning('Failed to refresh Nostr profile: $e');
         // Continue without profile update - offline-first behavior
       }
 
@@ -447,11 +436,11 @@ class SessionService {
       );
 
       if (addedCount > 0) {
-        debugPrint('Loaded $addedCount preferred relay(s) from NIP-05: $nip05');
+        Logger.info('Loaded $addedCount preferred relay(s) from NIP-05: $nip05');
       }
     } catch (e) {
       // Log error but don't fail - offline-first behavior
-      debugPrint('Warning: Failed to load preferred relays from NIP-05: $e');
+      Logger.warning('Failed to load preferred relays from NIP-05: $e');
     }
   }
 }