Fix schedule buy links in grouped results

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

@@ -278,6 +278,32 @@ describe("schedule search results body — action strip", () => {
   });
 });
 
+describe("schedule search results — inline buy link", () => {
+  it("threads buyUrlFor into grouped multi-day FlightList rows", () => {
+    const firstDay = makeDirectFlight({
+      depLocal: "2026-05-06T08:00:00+03:00",
+      arrLocal: "2026-05-06T10:30:00+03:00",
+    });
+    const secondDay = makeDirectFlight({
+      depLocal: "2026-05-07T14:00:00+03:00",
+      arrLocal: "2026-05-07T16:30:00+03:00",
+    });
+
+    render(
+      <DayGroupedFlightList
+        flights={[
+          { ...firstDay, id: "f-first-day" },
+          { ...secondDay, id: "f-second-day" },
+        ] as ISimpleFlight[]}
+        buyUrlFor={(flight) => `https://example.test/buy/${flight.id}`}
+      />,
+    );
+
+    const firstBuyLink = screen.getByTestId("flight-card-buy-link");
+    expect(firstBuyLink.getAttribute("href")).toBe("https://example.test/buy/f-first-day");
+  });
+});
+
 // ---------------------------------------------------------------------------
 // §4.1.14.3 — DayGroupedFlightList grouping + day headers
 // ---------------------------------------------------------------------------

src/features/schedule/components/DayGroupedFlightList.tsx

@@ -363,6 +363,7 @@ export const DayGroupedFlightList: FC<DayGroupedFlightListProps> = ({
                 direction="schedule"
                 renderExpandedBody={renderScheduleBody}
                 {...(onFlightClick ? { onFlightClick } : {})}
+                {...(buyUrlFor ? { buyUrlFor } : {})}
                 {...(resolvedInitialFlightId
                   ? { initialCurrentFlightId: resolvedInitialFlightId }
                   : {})}