feat(intercity): show intercity cargo across every train

Intercity bookings never get their own train — they ride whichever import/export
train passes through their corridor — so the work is scattered across other
people's schedules and there was nowhere to see it as a whole. The per-schedule
ride-along panel answers "what can THIS train carry"; this answers "what is
happening to intercity cargo".

Purely additive: the existing ride-along panel and the schedule detail page are
untouched, and loading/unloading still happens there, where the train's position
is confirmed. This is a read-only view that points back to it.

Each row carries both ends' facility status, because a booking whose origin or
destination has no equipment can never be worked there — the operator should see
that while the train is still coming, not when the load is refused. Those
bookings are counted and called out.

New GET /train-scheduling/intercity/bookings; the type is IntercityRideAlongRow,
not IntercityBookingRow, which already means the per-schedule candidate row.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

apps/edr-freight-web/backoffice/src/App.tsx

@@ -25,6 +25,7 @@ import {
   Users,
   Wallet,
   LifeBuoy,
+  TrainFront,
 } from "lucide-react";
 import { useEffect } from "react";
 import {
@@ -122,6 +123,7 @@ import InterchangeDocumentsPage from "./pages/warehouses/InterchangeDocumentsPag
 import InventoryInquiryPage from "./pages/warehouses/InventoryInquiryPage";
 import LoadedInventoryPage from "./pages/warehouses/LoadedInventoryPage";
 import LoadingQueuePage from "./pages/warehouses/LoadingQueuePage";
+import IntercityPage from "./pages/warehouses/IntercityPage";
 import WarehouseDashboardPage from "./pages/warehouses/WarehouseDashboardPage";
 import WarehouseDetailPage from "./pages/warehouses/WarehouseDetailPage";
 import WarehouseInventoryPage from "./pages/warehouses/WarehouseInventoryPage";
@@ -441,6 +443,18 @@ const buildSidebarSections = (demoItems: SidebarItem[]): SidebarSection[] => [
           },
         ],
       },
+      {
+        label: "Intercity",
+        href: "/dashboard/intercity",
+        icon: <TrainFront />,
+        children: [
+          {
+            label: "Intercity Cargo",
+            href: "/dashboard/intercity",
+            icon: <TrainFront />,
+          },
+        ],
+      },
       {
         label: "Warehouse Management",
         icon: <Container />,
@@ -933,6 +947,7 @@ const App = () => {
         <Route path="export-warehouse" element={<ExportWarehouseFlowPage />} />
         <Route path="arrival-queue" element={<ArrivalQueuePage />} />
         <Route path="loading-queue" element={<LoadingQueuePage />} />
+        <Route path="intercity" element={<IntercityPage />} />
         <Route path="loaded-inventory" element={<LoadedInventoryPage />} />
         <Route path="dispatch-queue" element={<DispatchQueuePage />} />
         <Route