feat(chat): implement pull-to-refresh functionality and pagination for chat history

src/data/dto/chat/__tests__/chat_history_response.test.ts

@@ -0,0 +1,17 @@
+import { describe, expect, it } from "vitest";
+
+import { ChatHistoryResponse } from "@/data/dto/chat";
+
+describe("ChatHistoryResponse", () => {
+  it("exposes the pagination total and limit used by chat history", () => {
+    const response = ChatHistoryResponse.from({
+      messages: [],
+      total: 120,
+      limit: 50,
+      offset: 0,
+    });
+
+    expect(response.total).toBe(120);
+    expect(response.limit).toBe(50);
+  });
+});

src/data/dto/chat/response/chat_history_response.ts

@@ -10,6 +10,8 @@ import { ChatMessage } from "../chat_message";
 
 export class ChatHistoryResponse {
   declare readonly messages: ChatMessage[];
+  declare readonly total: number;
+  declare readonly limit: number;
 
   private constructor(input: ChatHistoryResponseInput) {
     const data = ChatHistoryResponseSchema.parse(input);