fix(ui): сохранять точный выбор пира при экспорте WireGuard

app/(main)/wireguard/page.tsx

@@ -59,6 +59,7 @@ import {
   type ServerTileItem,
 } from "@/components/server-tile-rail"
 import { toast } from "sonner"
+import { selectWgExportPeer } from "@/lib/wg-export-peer"
 import { ConfigHistorySheet } from "@/components/config-history-sheet"
 import type { ConfigRevisionDto } from "@/lib/config-revisions"
 import {
@@ -601,12 +602,14 @@ function WireGuardPageContent({ selectedServerId, selectedInterfaceId, allInterf
     exportPending.current = epoch
     setExportBusy(true)
     try {
+      const peer = format === "peer-conf" ? selectWgExportPeer(exportIface.peers, exportPeerId) : undefined
+      if (format === "peer-conf" && !peer) throw new Error("Выбранный пир не найден. Обновите список и выберите пира заново.")
       const res = await exportWireGuard(backendUrl, {
         serverId: exportIface.serverId,
         interfaceName: exportIface.name,
         format,
         includePrivateKey: format !== "peer-conf",
-        peerId: format === "peer-conf" ? (exportPeerId ?? undefined) : undefined,
+        peerId: peer?.rosId ?? peer?.id,
       })
       if (epoch !== exportEpoch.current) return
       setLiveExport((prev) => ({