create exception for session web

lib/features/mailbox_dashboard/data/datasource_impl/session_storage_composer_datasoure_impl.dart

@@ -1,11 +1,12 @@
 import 'dart:convert';
+import 'package:core/core.dart';
 import 'package:jmap_dart_client/jmap/mail/email/email.dart';
 import 'package:model/model.dart';
 import 'package:tmail_ui_user/features/mailbox_dashboard/data/model/composer_cache.dart';
-import 'package:tmail_ui_user/features/mailbox_dashboard/data/datasource/composer_cache_datasource.dart';
+import 'package:tmail_ui_user/features/mailbox_dashboard/data/datasource/session_storage_composer_datasource.dart';
 import 'package:universal_html/html.dart' as html;
 
-class ComposerCacheDataSourceImpl extends ComposerCacheDataSource {
+class SessionStorageComposerDatasourceImpl extends SessionStorageComposerDatasource {
   @override
   ComposerCache getComposerCacheOnWeb() {
     try {
@@ -17,10 +18,10 @@ class ComposerCacheDataSourceImpl extends ComposerCacheDataSource {
         final emailCache = ComposerCache.fromJson(jsonHandle);
         return emailCache;
       } else {
-        throw UnimplementedError();
+        throw SessionWebException();
       }
     } catch (e) {
-      throw UnimplementedError(e.toString());
+      throw SessionWebException(errorMessage: e.toString());
     }
   }
 
@@ -30,7 +31,7 @@ class ComposerCacheDataSourceImpl extends ComposerCacheDataSource {
       html.window.sessionStorage
           .removeWhere((key, value) => key == EmailActionType.edit.name);
     } catch (e) {
-      throw UnimplementedError(e.toString());
+      throw SessionWebException(errorMessage: e.toString());
     }
   }
 
@@ -42,7 +43,7 @@ class ComposerCacheDataSourceImpl extends ComposerCacheDataSource {
       };
       html.window.sessionStorage.addAll(entries);
     } catch (e) {
-      throw UnimplementedError(e.toString());
+      throw SessionWebException(errorMessage: e.toString());
     }
   }
 }