Fix ScheduleDetailsPage happy-path breadcrumb + add missing breadcrumb tests

The final (success) return branch was passing a hardcoded 1-item breadcrumb
array instead of the computed `breadcrumbs` variable, so the leaf crumb built
from ?request= was silently dropped for loaded flights. Loading/error/empty
branches were already correct. Adds 3 unit tests to lock the wiring.

src/features/schedule/components/ScheduleDetailsPage.test.tsx

@@ -0,0 +1,166 @@
+/**
+ * Tests for ScheduleDetailsPage breadcrumb wiring.
+ *
+ * Verifies TZ §4.1.4 Table 7 rows 11-13: the leaf breadcrumb is built
+ * from the `?request=` query param when area === "schedule", and falls
+ * back to a single-item trail when no request param is present (share-link
+ * scenario).
+ *
+ * @vitest-environment jsdom
+ */
+
+import { describe, it, expect, vi, beforeEach } from "vitest";
+import { render, screen } from "@testing-library/react";
+import { ScheduleDetailsPage } from "./ScheduleDetailsPage.js";
+import type { IScheduleFlightId } from "../types.js";
+
+// ---------------------------------------------------------------------------
+// Controlled useSearchParams — overridden per test
+// ---------------------------------------------------------------------------
+let mockSearchParamsGet: (key: string) => string | null = () => null;
+
+vi.mock("@modern-js/runtime/router", () => ({
+  useSearchParams: () => [{ get: (k: string) => mockSearchParamsGet(k) }],
+  Link: ({
+    children,
+    to,
+    ...props
+  }: {
+    children: React.ReactNode;
+    to: string;
+    [k: string]: unknown;
+  }) => <a href={to} {...props}>{children}</a>,
+}));
+
+vi.mock("@/i18n/provider.js", () => ({
+  useTranslation: () => ({
+    t: (key: string, vars?: Record<string, unknown>) => {
+      if (vars) {
+        return Object.entries(vars).reduce(
+          (s: string, [k, v]) => s.replace(`{${k}}`, String(v)),
+          key,
+        );
+      }
+      return key;
+    },
+  }),
+}));
+
+vi.mock("@/i18n/resolver.js", () => ({
+  localeToLanguage: () => "ru",
+  normalizeLocaleParam: (l: string) => l,
+  DEFAULT_LANGUAGE: "ru",
+}));
+
+vi.mock("../hooks/useScheduleDetails.js", () => ({
+  useScheduleDetails: () => ({ flights: [], loading: true, error: null }),
+}));
+
+vi.mock("../seo.js", () => ({
+  buildScheduleDetailsSeo: () => ({}),
+}));
+
+vi.mock("@/ui/layout/PageLayout.js", () => ({
+  PageLayout: ({
+    children,
+    breadcrumbs,
+  }: {
+    children?: React.ReactNode;
+    breadcrumbs?: { label: string; url?: string }[];
+  }) => (
+    <div>
+      <nav data-testid="breadcrumbs">
+        {breadcrumbs?.map((b, i) => (
+          <span key={i} data-testid={`crumb-${i}`} data-url={b.url}>
+            {b.label}
+          </span>
+        ))}
+      </nav>
+      {children}
+    </div>
+  ),
+}));
+
+vi.mock("@/ui/layout/PageTabs.js", () => ({
+  PageTabs: () => <div />,
+}));
+
+vi.mock("@/ui/flights/FlightListSkeleton.js", () => ({
+  FlightListSkeleton: () => <div data-testid="skeleton" />,
+}));
+
+vi.mock("@/ui/seo/SeoHead.js", () => ({
+  SeoHead: () => null,
+}));
+
+// ---------------------------------------------------------------------------
+
+const flightId: IScheduleFlightId = {
+  carrier: "SU",
+  flightNumber: "1234",
+  date: "20260515",
+};
+
+describe("ScheduleDetailsPage breadcrumbs", () => {
+  beforeEach(() => {
+    mockSearchParamsGet = () => null;
+  });
+
+  it("shows 1-item trail when no ?request= param (share-link)", () => {
+    render(
+      <ScheduleDetailsPage
+        flights={[flightId]}
+        locale="ru-ru"
+        canonicalOrigin="https://example.com"
+      />,
+    );
+    expect(screen.queryByTestId("crumb-0")).toBeTruthy();
+    expect(screen.queryByTestId("crumb-1")).toBeNull();
+  });
+
+  it("shows 2-item trail with route leaf when ?request= carries schedule area (one-way)", () => {
+    mockSearchParamsGet = (k) =>
+      k === "request"
+        ? "schedule-route-NBC-KHV-20220307-20220313"
+        : null;
+
+    render(
+      <ScheduleDetailsPage
+        flights={[flightId]}
+        locale="ru-ru"
+        canonicalOrigin="https://example.com"
+      />,
+    );
+
+    const crumb0 = screen.getByTestId("crumb-0");
+    const crumb1 = screen.getByTestId("crumb-1");
+    expect(crumb0.textContent).toContain("SCHEDULE.TITLE");
+    // Leaf label key is BREADCRUMBS.SCHEDULE-ROUTE (the mock t() returns the
+    // key since it has no literal {…} placeholders in the key string itself)
+    expect(crumb1.textContent).toContain("BREADCRUMBS.SCHEDULE-ROUTE");
+    // Back URL must rebuild a schedule search URL with the IATA codes
+    const backUrl = crumb1.getAttribute("data-url") ?? "";
+    expect(backUrl).toContain("/schedule/");
+    expect(backUrl).toContain("NBC");
+    expect(backUrl).toContain("KHV");
+  });
+
+  it("ignores ?request= that carries onlineboard area", () => {
+    mockSearchParamsGet = (k) =>
+      k === "request"
+        ? "onlineboard-route-MOW-LED-20260515"
+        : null;
+
+    render(
+      <ScheduleDetailsPage
+        flights={[flightId]}
+        locale="ru-ru"
+        canonicalOrigin="https://example.com"
+      />,
+    );
+
+    // Should stay at 1-item trail — no leaf
+    expect(screen.getByTestId("crumb-0")).toBeTruthy();
+    expect(screen.queryByTestId("crumb-1")).toBeNull();
+  });
+});

src/features/schedule/components/ScheduleDetailsPage.tsx

@@ -268,7 +268,7 @@ export const ScheduleDetailsPage: FC<ScheduleDetailsPageProps> = ({
         </div>
       }
       title={<h1 className="text--white page-title">{title}</h1>}
-      breadcrumbs={[{ label: t("SCHEDULE.TITLE"), url: scheduleHref }]}
+      breadcrumbs={breadcrumbs}
     >
       <SeoHead {...seoProps} />
       {/* Angular renders `flight-details-full-route` once at the top for