feat(ux): Finalize advanced UX with plot zoom, export, and shadcn UI consistency.

frontend/src/services/chat_history.test.ts

@@ -1,10 +1,15 @@
-import { describe, it, expect, vi, beforeEach } from "vitest"
+import { describe, it, expect, vi, beforeEach, type MockInstance } from "vitest"
 import api from "./api"
 import { ChatService } from "./chat"
-import { AxiosResponse } from "axios"
+import type { AxiosResponse } from "axios"
 
 vi.mock("./api")
-const mockedApi = vi.mocked(api)
+const mockedApi = api as unknown as {
+  get: MockInstance<typeof api.get>
+  post: MockInstance<typeof api.post>
+  patch: MockInstance<typeof api.patch>
+  delete: MockInstance<typeof api.delete>
+}
 
 describe("ChatService History Management", () => {
   beforeEach(() => {