fix(ui): не подставлять выдуманный cost соседа OSPF

components/data-grids/ospf-neighbors-data-grid.tsx

@@ -30,7 +30,7 @@ export interface OspfNeighborRow {
   remoteRouterId: string
   area: string
   state: OspfNeighborState
-  cost: number
+  cost: number | null
   uptime: string
   priority: number
 }
@@ -149,7 +149,7 @@ function OspfNeighborsDataGrid({
         accessorKey: "cost",
         header: ({ column }) => <DataGridSortHeader column={column} title="Cost" />,
         cell: ({ row }) => (
-          <span className="font-mono tabular-nums text-center block">{row.original.cost}</span>
+          <span className="font-mono tabular-nums text-center block">{row.original.cost ?? "—"}</span>
         ),
         meta: {
           headerTitle: "Cost",