fix: keep session when refresh fails on network error or 5xx (WealthLedger/frontend#97)

src/app/routes/AppRoutes/AppRoutes.test.tsx

@@ -190,6 +190,30 @@ describe("AppRoutes", () => {
 		expect(document.title).toBe("Карты — WealthLedger");
 	});
 
+	it("offers a retry instead of the login form while the server is unreachable, then restores the route", async () => {
+		let isOutage = true;
+		server.use(
+			http.post("*/api/v1/auth/refresh", () =>
+				isOutage
+					? new HttpResponse(null, { status: 502 })
+					: HttpResponse.json({
+							accessToken: "test-token",
+							user: { email: "user@example.com", id: "user-1" },
+						}),
+			),
+		);
+		renderRoutes("/accounts");
+
+		expect(await screen.findByRole("alert")).toHaveTextContent("Не удалось подключиться");
+		expect(screen.queryByRole("heading", { name: "Вход" })).not.toBeInTheDocument();
+		isOutage = false;
+		fireEvent.click(screen.getByRole("button", { name: "Повторить" }));
+
+		expect(
+			await screen.findByRole("heading", { level: 2, name: "Нет инвестиционных счетов" }),
+		).toBeVisible();
+	});
+
 	it("lazy-loads the protected shell for an authenticated accounts route", async () => {
 		server.use(
 			http.post("*/api/v1/auth/refresh", () =>