feat: show persisted investment data and sync state

Consume the provided resource-envelope API snapshot. Preserve financial snapshots during
refresh, observe synchronization without importing, and fence late responses across
account and connection changes.

src/pages/account-operations/ui/AccountOperationsPage/AccountOperationsPage.test.tsx

@@ -10,6 +10,7 @@ import {
 } from "@/entities/broker-operation";
 import { configureAuthClient } from "@/shared/api";
 import { createTestQueryClient } from "@/test/query";
+import { resource } from "@/test/resource";
 import { server } from "@/test/server";
 import { AccountOperationsPage } from "./AccountOperationsPage";
 
@@ -39,11 +40,13 @@ function configureTestAuth() {
 	});
 }
 
-function renderPage() {
+function renderPage(search = "") {
 	return render(
 		<QueryClientProvider client={createTestQueryClient()}>
 			<MantineProvider>
-				<MemoryRouter initialEntries={["/accounts/account-1/operations"]}>
+				<MemoryRouter
+					initialEntries={[`/accounts/account-1/operations${search}`]}
+				>
 					<Routes>
 						<Route
 							path="/accounts/:accountId/operations"
@@ -193,13 +196,15 @@ describe("AccountOperationsPage", () => {
 				({ request }) => {
 					const url = new URL(request.url);
 					searches.push(url.search);
-					return HttpResponse.json({
-						accountId: "account-1",
-						items: [operation],
-						nextCursor: url.searchParams.get("cursor") ? null : "next-1",
-						hasNext: !url.searchParams.get("cursor"),
-						observedAt: "2026-08-14T00:00:00Z",
-					});
+					return HttpResponse.json(
+						resource({
+							accountId: "account-1",
+							items: [operation],
+							nextCursor: url.searchParams.get("cursor") ? null : "next-1",
+							hasNext: !url.searchParams.get("cursor"),
+							observedAt: "2026-08-14T00:00:00Z",
+						}),
+					);
 				},
 			),
 		);
@@ -229,13 +234,15 @@ describe("AccountOperationsPage", () => {
 				({ request }) => {
 					const url = new URL(request.url);
 					searches.push(url.search);
-					return HttpResponse.json({
-						accountId: "account-1",
-						items: [operation],
-						nextCursor: null,
-						hasNext: false,
-						observedAt: "2026-08-14T00:00:00Z",
-					});
+					return HttpResponse.json(
+						resource({
+							accountId: "account-1",
+							items: [operation],
+							nextCursor: null,
+							hasNext: false,
+							observedAt: "2026-08-14T00:00:00Z",
+						}),
+					);
 				},
 			),
 		);
@@ -262,13 +269,15 @@ describe("AccountOperationsPage", () => {
 				({ request }) => {
 					const url = new URL(request.url);
 					searches.push(url.search);
-					return HttpResponse.json({
-						accountId: "account-1",
-						items: [operation],
-						nextCursor: null,
-						hasNext: false,
-						observedAt: "2026-08-14T00:00:00Z",
-					});
+					return HttpResponse.json(
+						resource({
+							accountId: "account-1",
+							items: [operation],
+							nextCursor: null,
+							hasNext: false,
+							observedAt: "2026-08-14T00:00:00Z",
+						}),
+					);
 				},
 			),
 		);
@@ -301,3 +310,58 @@ describe("AccountOperationsPage", () => {
 		).toBeInTheDocument();
 	});
 });
+
+it("does not label incomplete empty operations as a confirmed empty period", async () => {
+	configureTestAuth();
+	server.use(
+		http.get("*/api/v1/brokerage-accounts/:accountId/operations", () =>
+			HttpResponse.json(
+				resource(
+					{
+						accountId: "account-1",
+						items: [],
+						hasNext: false,
+						nextCursor: null,
+					},
+					{ availability: "partial" },
+				),
+			),
+		),
+	);
+	renderPage();
+	expect(await screen.findByText("Период загружен не полностью")).toBeVisible();
+	expect(screen.queryByText("Операций нет")).not.toBeInTheDocument();
+});
+
+it("recovers an invalid cursor at the first page without clearing applied filters", async () => {
+	configureTestAuth();
+	const searches: URLSearchParams[] = [];
+	server.use(
+		http.get(
+			"*/api/v1/brokerage-accounts/:accountId/operations",
+			({ request }) => {
+				const params = new URL(request.url).searchParams;
+				searches.push(params);
+				if (params.has("cursor"))
+					return HttpResponse.json(
+						{ code: "INVALID_OPERATIONS_CURSOR" },
+						{ status: 400 },
+					);
+				return HttpResponse.json(
+					resource({
+						items: [operation],
+						hasNext: true,
+						nextCursor: "old-cursor",
+					}),
+				);
+			},
+		),
+	);
+	renderPage("?from=2026-08-01&to=2026-08-14&categories=trade");
+	fireEvent.click(await screen.findByRole("button", { name: "Далее" }));
+	fireEvent.click(await screen.findByRole("button", { name: "Повторить" }));
+	await waitFor(() => expect(searches.length).toBe(3));
+	expect(searches[2].get("cursor")).toBeNull();
+	for (const key of ["from", "to", "categories"])
+		expect(searches[2].get(key)).toBe(searches[0].get(key));
+});