TF-528 Apply linter for some widget

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

@@ -70,7 +70,7 @@ class EmailAPI {
 
     if (emailRequest.emailIdDestroyed != null) {
       setEmailMethod
-        ..addDestroy({emailRequest.emailIdDestroyed!.id});
+        .addDestroy({emailRequest.emailIdDestroyed!.id});
     }
 
     final setEmailSubmissionMethod = SetEmailSubmissionMethod(accountId)
@@ -160,7 +160,7 @@ class EmailAPI {
       String baseDownloadUrl,
       AccountRequest accountRequest
   ) async {
-    var externalStorageDirPath;
+    String externalStorageDirPath;
     if (Platform.isAndroid) {
       externalStorageDirPath = await ExternalPath.getExternalStoragePublicDirectory(ExternalPath.DIRECTORY_DOWNLOADS);
     } else if (Platform.isIOS) {
@@ -381,7 +381,7 @@ class EmailAPI {
   Future<bool> deleteEmailPermanently(AccountId accountId, EmailId emailId) async {
     final requestBuilder = JmapRequestBuilder(_httpClient, ProcessingInvocation());
     final setEmailMethod = SetEmailMethod(accountId)
-      ..addDestroy(Set.of([emailId.id]));
+      ..addDestroy({emailId.id});
 
     final setEmailInvocation = requestBuilder.invocation(setEmailMethod);
 

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

@@ -78,10 +78,10 @@ class EmailRepositoryImpl extends EmailRepository {
       String? baseUrlDownload,
       AccountId accountId
     ) async {
-    final mapUrlDownloadCID = Map<String, String>.fromIterable(
-        attachmentInlines,
-        key: (attachment) => attachment.cid!,
-        value: (attachment) => attachment.getDownloadUrl(baseUrlDownload, accountId));
+    final mapUrlDownloadCID = {
+      for (var attachment in attachmentInlines)
+        attachment.cid! : attachment.getDownloadUrl(baseUrlDownload!, accountId)
+    };
     return await Future.wait(emailContents
       .map((emailContent) async {
         return await _htmlDataSource.transformEmailContent(emailContent, mapUrlDownloadCID);