feat: 优化前端 UI 与交互体验

apps/lib/features/chat/presentation/bloc/chat_bloc.dart

@@ -280,16 +280,6 @@ class ChatBloc extends Cubit<ChatState> {
           sender: MessageSender.ai,
         ),
       );
-    } else if (event.resultSummary.isNotEmpty) {
-      _upsertById(
-        items,
-        TextMessageItem(
-          id: event.messageId,
-          content: event.resultSummary,
-          timestamp: timestamp,
-          sender: MessageSender.ai,
-        ),
-      );
     }
 
     emit(state.copyWith(items: items));
@@ -311,7 +301,10 @@ class ChatBloc extends Cubit<ChatState> {
   List<ChatListItem> _convertHistoryMessages(List<HistoryMessage> messages) {
     final converted = <ChatListItem>[];
     for (final msg in messages) {
-      final sender = msg.role == 'user' ? MessageSender.user : MessageSender.ai;
+      final normalizedRole = msg.role.toLowerCase();
+      final isUser = normalizedRole == 'user';
+      final isTool = normalizedRole == 'tool' || normalizedRole == 'tools';
+      final sender = isUser ? MessageSender.user : MessageSender.ai;
       final attachments = msg.attachments
           .map(
             (attachment) => <String, dynamic>{
@@ -321,7 +314,7 @@ class ChatBloc extends Cubit<ChatState> {
           )
           .toList();
 
-      if (msg.content.isNotEmpty || sender == MessageSender.user) {
+      if (!isTool && (msg.content.isNotEmpty || isUser)) {
         converted.add(
           TextMessageItem(
             id: msg.id,