fix(ui): подтверждать удаление туннеля GRE

app/(main)/gre/page.tsx

@@ -275,6 +275,8 @@ function GrePageContent({ selectedServerId, selectedTunnelId, allTunnelsHref, on
   const [tunnelMode,      setTunnelMode]      = useState<"create" | "edit">("create")
   const [editingTunnel,   setEditingTunnel]   = useState<GreTunnel | null>(null)
   const [pendingDelete,   setPendingDelete]   = useState<GreTunnel | null>(null)
+  const deleteLock = useRef(false)
+  const [deleteError, setDeleteError] = useState<string | null>(null)
   const [mutateBusy,      setMutateBusy]      = useState(false)
   const [liveStale,       setLiveStale]       = useState(false)
   const [historyOpen,     setHistoryOpen]     = useState(false)
@@ -506,19 +508,23 @@ function GrePageContent({ selectedServerId, selectedTunnelId, allTunnelsHref, on
 
   async function confirmDeleteTunnel() {
     const t = pendingDelete
-    if (!t || !isLive) return
+    if (!t || !isLive || mutationsLocked || deleteLock.current) return
+    deleteLock.current = true
+    setDeleteError(null)
     setMutateBusy(true)
     try {
-      await apiFetch("/api/gre/tunnels", {
+      const result = await apiFetch<{ ok: boolean }>("/api/gre/tunnels", {
         method: "DELETE",
         body: JSON.stringify({ serverId: t.serverId, rosId: t.id, name: t.name }),
       })
+      if (result?.ok !== true) throw new Error("Сервер не подтвердил удаление туннеля")
       toast.success(`Удалён ${t.name}`)
       setPendingDelete(null)
       await loadLive()
     } catch (err) {
-      toast.error("Не удалось удалить туннель", { description: String(err) })
+      setDeleteError(err instanceof Error ? err.message : "Не удалось удалить туннель")
     } finally {
+      deleteLock.current = false
       setMutateBusy(false)
     }
   }
@@ -1091,7 +1097,7 @@ function GrePageContent({ selectedServerId, selectedTunnelId, allTunnelsHref, on
         onRestore={restoreRevision}
       />
 
-      <AlertDialog open={!!pendingDelete} onOpenChange={(v) => { if (!v) setPendingDelete(null) }}>
+      <AlertDialog open={!!pendingDelete} onOpenChange={(v) => { if (!v && !deleteLock.current) { setPendingDelete(null); setDeleteError(null) } }}>
         <AlertDialogContent size="default">
           <AlertDialogHeader>
             <AlertDialogMedia className="bg-destructive/10 text-destructive">
@@ -1103,10 +1109,12 @@ function GrePageContent({ selectedServerId, selectedTunnelId, allTunnelsHref, on
                 ? `${pendingDelete.name} на сервере ${serverById[pendingDelete.serverId]?.name ?? pendingDelete.serverId}. Будут удалены интерфейс и связанный /ip/address.`
                 : null}
             </AlertDialogDescription>
+            {mutateBusy && <p role="status" className="text-sm text-muted-foreground">Ожидание результата удаления…</p>}
+            {deleteError && <p role="alert" className="text-sm text-destructive">{deleteError}</p>}
           </AlertDialogHeader>
           <AlertDialogFooter>
-            <AlertDialogCancel onClick={() => setPendingDelete(null)}>Отмена</AlertDialogCancel>
-            <AlertDialogAction variant="destructive" onClick={() => void confirmDeleteTunnel()}>
+            <AlertDialogCancel disabled={mutateBusy}>Отмена</AlertDialogCancel>
+            <AlertDialogAction variant="destructive" disabled={mutationsLocked} onClick={(e) => { e.preventDefault(); void confirmDeleteTunnel() }}>
               Удалить
             </AlertDialogAction>
           </AlertDialogFooter>