refactor: align frontend ownership boundaries

Close audit gaps across API drift, query policy, UI, and tests.

src/test/handlers.ts

@@ -52,6 +52,14 @@ const handlers = [
 			events: [],
 		}),
 	),
+	http.get("*/api/v1/brokerage-accounts/:accountId/income-summary", () =>
+		HttpResponse.json({
+			accountId: "account-1",
+			period: { from: "2026-01-01", to: "2026-08-14" },
+			totalsByCurrency: [],
+			calculatedAt: "2026-08-14T00:00:00Z",
+		}),
+	),
 ];
 
 export { handlers };

src/test/query.tsx

@@ -0,0 +1,23 @@
+import { QueryClient, QueryClientProvider } from "@tanstack/react-query";
+import type { FC, PropsWithChildren } from "react";
+
+function createTestQueryClient(): QueryClient {
+	return new QueryClient({
+		defaultOptions: {
+			queries: { retry: false },
+			mutations: { retry: false },
+		},
+	});
+}
+
+function createQueryWrapper(queryClient = createTestQueryClient()) {
+	const QueryWrapper: FC<PropsWithChildren> = (props) => (
+		<QueryClientProvider client={queryClient}>
+			{props.children}
+		</QueryClientProvider>
+	);
+
+	return { queryClient, wrapper: QueryWrapper };
+}
+
+export { createQueryWrapper, createTestQueryClient };

src/test/setup.ts

@@ -1,10 +1,16 @@
 import "@testing-library/jest-dom/vitest";
+import { cleanup } from "@testing-library/react";
 import { afterAll, afterEach, beforeAll } from "vitest";
+import { configureAuthClient } from "@/shared/api";
 import "../shared/i18n";
 import { server } from "./server";
 
 beforeAll(() => server.listen({ onUnhandledRequest: "error" }));
-afterEach(() => server.resetHandlers());
+afterEach(() => {
+	cleanup();
+	configureAuthClient(null);
+	server.resetHandlers();
+});
 afterAll(() => server.close());
 
 class ResizeObserver {