TF-495 Implement linter for mailbox view

lib/features/mailbox/data/datasource_impl/state_datasource_impl.dart

@@ -16,7 +16,7 @@ class StateDataSourceImpl extends StateDataSource {
   Future<State?> getState(StateType stateType) {
     return Future.sync(() async {
       final stateCache = await _stateCacheClient.getItem(stateType.value);
-      return stateCache != null ? stateCache.toState() : null;
+      return stateCache?.toState();
     }).catchError((error) {
       throw error;
     });

lib/features/mailbox/data/extensions/list_mailbox_cache_extension.dart

@@ -3,9 +3,6 @@ import 'package:tmail_ui_user/features/mailbox/data/model/mailbox_cache.dart';
 
 extension ListMailboxCacheExtension on List<MailboxCache> {
   Map<String, MailboxCache> toMap() {
-    return Map<String, MailboxCache>.fromIterable(
-        this,
-        key: (mailboxCache) => mailboxCache.id,
-        value: (mailboxCache) => mailboxCache);
+    return { for (var mailboxCache in this) mailboxCache.id : mailboxCache };
   }
 }

lib/features/mailbox/data/network/mailbox_api.dart

@@ -158,14 +158,14 @@ class MailboxAPI {
       final requestBuilder = JmapRequestBuilder(httpClient, ProcessingInvocation());
       final currentSetMailboxInvocations = currentExecuteList.map((mailboxId) {
           return SetMailboxMethod(accountId)
-            ..addDestroy(Set.of([mailboxId.id]))
+            ..addDestroy({mailboxId.id})
             ..addOnDestroyRemoveEmails(true);
           })
         .map(requestBuilder.invocation)
         .toList();
 
       final response = await (requestBuilder
-          ..usings(Set.of([CapabilityIdentifier.jmapCore, CapabilityIdentifier.jmapMail])))
+          ..usings({CapabilityIdentifier.jmapCore, CapabilityIdentifier.jmapMail}))
         .build()
         .execute();