TF-2026 Implement SaveToDraft method

(cherry picked from commit cf03def2f5de115fb9feb64af6686c3957b8f1f2)

lib/features/email/data/datasource/email_datasource.dart

@@ -71,7 +71,7 @@ abstract class EmailDataSource {
 
   Future<bool> removeEmailDrafts(Session session, AccountId accountId, EmailId emailId);
 
-  Future<Email> updateEmailDrafts(Session session, AccountId accountId, Email newEmail);
+  Future<Email> updateEmailDrafts(Session session, AccountId accountId, Email newEmail, EmailId oldEmailId);
 
   Future<List<EmailId>> deleteMultipleEmailsPermanently(Session session, AccountId accountId, List<EmailId> emailIds);
 

lib/features/email/data/datasource_impl/email_datasource_impl.dart

@@ -113,9 +113,9 @@ class EmailDataSourceImpl extends EmailDataSource {
   }
 
   @override
-  Future<Email> updateEmailDrafts(Session session, AccountId accountId, Email newEmail) {
+  Future<Email> updateEmailDrafts(Session session, AccountId accountId, Email newEmail, EmailId oldEmailId) {
     return Future.sync(() async {
-      return await emailAPI.updateEmailDrafts(session, accountId, newEmail);
+      return await emailAPI.updateEmailDrafts(session, accountId, newEmail, oldEmailId);
     }).catchError(_exceptionThrower.throwException);
   }
 

lib/features/email/data/datasource_impl/email_hive_cache_datasource_impl.dart

@@ -155,7 +155,7 @@ class EmailHiveCacheDataSourceImpl extends EmailDataSource {
   }
 
   @override
-  Future<Email> updateEmailDrafts(Session session, AccountId accountId, Email newEmail) {
+  Future<Email> updateEmailDrafts(Session session, AccountId accountId, Email newEmail, EmailId oldEmailId) {
     throw UnimplementedError();
   }
 

lib/features/email/data/network/email_api.dart

@@ -541,11 +541,13 @@ class EmailAPI with HandleSetErrorMixin {
   Future<Email> updateEmailDrafts(
     Session session,
     AccountId accountId,
-    Email newEmail
+    Email newEmail,
+    EmailId oldEmailId
   ) async {
     final idCreateMethod = Id(_uuid.v1());
     final setEmailMethod = SetEmailMethod(accountId)
-      ..addCreate(idCreateMethod, newEmail);
+      ..addCreate(idCreateMethod, newEmail)
+      ..addDestroy({oldEmailId.id});
 
     final requestBuilder = JmapRequestBuilder(_httpClient, ProcessingInvocation());
 
@@ -565,10 +567,11 @@ class EmailAPI with HandleSetErrorMixin {
     );
 
     final emailUpdated = setEmailResponse?.created?[idCreateMethod];
+    final isEmailDeleted = setEmailResponse?.destroyed?.contains(oldEmailId.id);
     final listEntriesErrors = _handleSetEmailResponse([setEmailResponse]);
     final mapErrors = Map.fromEntries(listEntriesErrors);
 
-    if (emailUpdated != null && mapErrors.isEmpty) {
+    if (emailUpdated != null && isEmailDeleted == true && mapErrors.isEmpty) {
       return emailUpdated;
     } else {
       throw SetEmailMethodException(mapErrors);

lib/features/email/data/repository/email_repository_impl.dart

@@ -136,8 +136,8 @@ class EmailRepositoryImpl extends EmailRepository {
   }
 
   @override
-  Future<Email> updateEmailDrafts(Session session, AccountId accountId, Email newEmail) {
-    return emailDataSource[DataSourceType.network]!.updateEmailDrafts(session, accountId, newEmail);
+  Future<Email> updateEmailDrafts(Session session, AccountId accountId, Email newEmail, EmailId oldEmailId) {
+    return emailDataSource[DataSourceType.network]!.updateEmailDrafts(session, accountId, newEmail, oldEmailId);
   }
 
   @override