TF-3416 Persist preview EML content when make reload page action

core/lib/data/model/source_type/data_source_type.dart

@@ -2,5 +2,6 @@
 enum DataSourceType {
   network,
   local,
+  session,
   hiveCache;
 }

core/lib/utils/app_logger.dart

@@ -7,7 +7,7 @@ import 'package:flutter/material.dart';
 final logHistory = _Dispatcher('');
 
 void log(String? value, {Level level = Level.info}) {
-  if (!kDebugMode) return;
+  // if (!kDebugMode) return;
 
   String logsStr = value ?? '';
   logHistory.value = '$logsStr\n${logHistory.value}';