Add presentation layer for mailbox, mail, message

model/lib/mail/presentation_mail.dart

@@ -1,17 +0,0 @@
-
-import 'package:equatable/equatable.dart';
-
-class PresentationMail with EquatableMixin {
-
-  final String id;
-  final String? message;
-
-  PresentationMail(this.id, {this.message});
-
-  factory PresentationMail.createMailEmpty() {
-    return PresentationMail('empty');
-  }
-
-  @override
-  List<Object?> get props => [id, message];
-}

model/lib/mail/presentation_thread.dart

@@ -0,0 +1,17 @@
+
+import 'package:equatable/equatable.dart';
+
+class PresentationThread with EquatableMixin {
+
+  final String id;
+  final String? message;
+
+  PresentationThread(this.id, {this.message});
+
+  factory PresentationThread.createThreadEmpty() {
+    return PresentationThread('empty');
+  }
+
+  @override
+  List<Object?> get props => [id, message];
+}

model/lib/model.dart

@@ -14,4 +14,4 @@ export 'mailbox/select_mode.dart';
 export 'mailbox/expand_mode.dart';
 
 // Mail
-export 'mail/presentation_mail.dart';
+export 'mail/presentation_thread.dart';