OnlineBoard search: render Купить/Онлайн регистрация in expanded row

Angular's board search results expansion shows [Купить] [Онлайн
регистрация] [Детали рейса]. React only rendered Details. Added a
`renderActions` prop on FlightCard/FlightList so the feature layer
can inject extra buttons without the ui layer importing from
features. OnlineBoardSearchPage wires it to FlightActions with
showShare=false (the row already has a dedicated share icon).

Visibility rules fall through to canBuyTicket / canRegister (same
as BoardDetailsHeader), so cancelled/past flights still hide the
Buy button and carriers without a registrationUrl still hide the
Online Registration button — matching Angular's per-flight gating.

Integration test mocks useAppSettings to avoid requiring the real
ApiClientProvider in flight-search.test.tsx.

tests/integration/online-board/flight-search.test.tsx

@@ -64,6 +64,24 @@ vi.mock("@/shared/dictionaries/index.js", () => ({
   useDictionaries: () => ({ dictionaries: null, loading: false, error: null }),
 }));
 
+// FlightActions (rendered inside each expanded flight row) pulls the
+// buy/registration window lengths from useAppSettings, which itself
+// needs the ApiClientProvider. Integration tests don't wire the real
+// API client, so mock useAppSettings with the Angular defaults.
+vi.mock("@/shared/hooks/useAppSettings.js", () => ({
+  useAppSettings: () => ({
+    onlineboardSearchFrom: 1,
+    onlineboardSearchTo: 7,
+    scheduleSearchFrom: 1,
+    scheduleSearchTo: 330,
+    flightStatusAvailableFromHours: 2,
+    buyTicketMinHours: 2,
+    buyTicketMaxHours: 72,
+    loading: false,
+    error: null,
+  }),
+}));
+
 // ---------------------------------------------------------------------------
 // Helpers
 // ---------------------------------------------------------------------------