Enhance H5 QA session interactions

hy_qa_asset_backend/frontend/lib/h5MockQa.ts

@@ -8,9 +8,19 @@ export type ChatMessage = {
   content: string;
   source?: string;
   boundary?: string;
+  feedback?: "liked" | "disliked";
   createdAt: string;
 };
 
+export type ChatSession = {
+  id: string;
+  title: string;
+  preview: string;
+  messages: ChatMessage[];
+  updatedAt: string;
+  questionCount: number;
+};
+
 export type SuggestedQuestion = {
   id: string;
   text: string;
@@ -46,6 +56,32 @@ export const initialMessages: ChatMessage[] = [
   }
 ];
 
+export function createEmptySession(): ChatSession {
+  return {
+    id: `session-${Date.now()}`,
+    title: "新的问答",
+    preview: "还没有开始提问",
+    messages: initialMessages,
+    updatedAt: new Date().toISOString(),
+    questionCount: 0
+  };
+}
+
+export function summarizeSession(sessionId: string, messages: ChatMessage[]): ChatSession {
+  const userMessages = messages.filter((message) => message.role === "user");
+  const lastMessage = [...messages].reverse().find((message) => message.role === "assistant" || message.role === "user");
+  const firstQuestion = userMessages[0]?.content;
+
+  return {
+    id: sessionId,
+    title: firstQuestion ? firstQuestion.slice(0, 24) : "新的问答",
+    preview: lastMessage?.content.slice(0, 42) ?? "还没有开始提问",
+    messages,
+    updatedAt: new Date().toISOString(),
+    questionCount: userMessages.length
+  };
+}
+
 export const mockCallableQa: CallableQAItem[] = [
   {
     id: 9001,