TF-4141 Fix nitpick comments from coderabbit

lib/features/mailbox/presentation/extensions/list_mailbox_node_extension.dart

@@ -59,6 +59,6 @@ extension ListMailboxNodeExtension on List<MailboxNode> {
   }
 
   bool _equalsIgnoreCase(String? value, String expected) {
-    return value != null && value.toLowerCase() == expected;
+    return value != null && value.toLowerCase() == expected.toLowerCase();
   }
 }

lib/features/thread/presentation/thread_controller.dart

@@ -684,6 +684,7 @@ class ThreadController extends BaseController with EmailActionController {
           {
             EmailFilterCondition(
               hasKeyword: KeyWordIdentifier.emailFlagged.value,
+              before: before,
             ),
             EmailFilterCondition(
               notKeyword: KeyWordIdentifier.emailSeen.value,