TF-1715 Load emails in favorite folder with filters

model/lib/extensions/mailbox_id_extension.dart

@@ -3,7 +3,6 @@ import 'package:jmap_dart_client/jmap/core/reference_id.dart';
 import 'package:jmap_dart_client/jmap/mail/email/keyword_identifier.dart';
 import 'package:jmap_dart_client/jmap/mail/mailbox/mailbox.dart';
 import 'package:model/extensions/keyword_identifier_extension.dart';
-import 'package:model/mailbox/presentation_mailbox.dart';
 
 extension MailboxIdExtension on MailboxId {
   String generatePath() {
@@ -32,7 +31,4 @@ extension MailboxIdExtension on MailboxId {
   }
 
   String get asString => id.value;
-
-  bool get isFavoriteMailboxId =>
-      this == PresentationMailbox.favoriteFolder.id;
 }

model/lib/extensions/presentation_mailbox_extension.dart

@@ -34,6 +34,8 @@ extension PresentationMailboxExtension on PresentationMailbox {
 
   bool get isSpam => role == PresentationMailbox.roleSpam || role == PresentationMailbox.roleJunk;
 
+  bool get isFavorite => role == PresentationMailbox.roleFavorite;
+
   bool get isTrash => role == PresentationMailbox.roleTrash;
 
   bool get isDrafts => role == PresentationMailbox.roleDrafts;

model/lib/mailbox/presentation_mailbox.dart

@@ -24,7 +24,7 @@ class PresentationMailbox with EquatableMixin {
   static final PresentationMailbox favoriteFolder = PresentationMailbox(
     MailboxId(Id(favoriteRole)),
     name: MailboxName('Starred'),
-    role: Role(favoriteRole),
+    role: roleFavorite,
   );
 
   static final roleInbox = Role(inboxRole);
@@ -37,6 +37,7 @@ class PresentationMailbox with EquatableMixin {
   static final roleJunk = Role(junkRole);
   static final roleArchive = Role(archiveRole);
   static final roleRecovered = Role(recoveredRole);
+  static final roleFavorite = Role(favoriteRole);
 
   final MailboxId id;
   final MailboxName? name;