fix(chat): reconcile reply recovery with continuous agent conversations

electron/coding-teacher/reply.ts

@@ -13,9 +13,10 @@ export function applyTeacherReply(request: TeacherRequest, raw: string): void {
   // Apply the current UI contract only to new replies; archived replies keep
   // their original cards through the compatibility parser and topic store.
   if (parsed.quickReplies.length > MAX_CURRENT_QUICK_REPLIES) {
+    request.replyQuickRepliesRejected = true;
     parsed.quickReplies = [];
     parsed.parseError ??= '快捷回复超过当前界面最多 3 条的限制，正文已保留，快捷回复未展示。';
-  }
+  } else delete request.replyQuickRepliesRejected;
   request.response = parsed.reply;
   request.suggestedQuestions = parsed.quickReplies;
   if (parsed.incomplete) request.replyIncomplete = true;