fix(ui): сохранять ошибку загрузки истории IPsec

app/(main)/ipsec/page.tsx

@@ -1,6 +1,6 @@
 "use client"
 
-import { useCallback, useEffect, useMemo, useState } from "react"
+import { useCallback, useEffect, useMemo, useRef, useState } from "react"
 import { PageHeader } from "@/components/page-header"
 import { servers as mockServers } from "@/lib/data"
 import type { Server } from "@/lib/data"
@@ -190,6 +190,8 @@ export default function IpsecPage() {
   const [historyOpen, setHistoryOpen] = useState(false)
   const [revisions, setRevisions] = useState<ConfigRevisionDto[]>([])
   const [historyLoading, setHistoryLoading] = useState(false)
+  const [historyError, setHistoryError] = useState<string | null>(null)
+  const historyEpoch = useRef(0)
   const [historyRestoring, setHistoryRestoring] = useState(false)
 
   const loadLive = useCallback(async () => {
@@ -245,20 +247,26 @@ export default function IpsecPage() {
 
   const historyServerId = effectiveServerId === ALL_SERVERS_ID ? null : effectiveServerId
 
+  useEffect(() => () => { historyEpoch.current += 1 }, [historyServerId, backendUrl, isLive])
+
   const loadRevisions = useCallback(async () => {
     if (!isLive || !historyServerId) return
+    const epoch = ++historyEpoch.current
     setHistoryLoading(true)
+    setHistoryError(null)
     try {
       const res = await requestJson<{ revisions: ConfigRevisionDto[] }>(
         backendUrl,
         `/api/ipsec/revisions?serverId=${encodeURIComponent(historyServerId)}`,
       )
+      if (epoch !== historyEpoch.current) return
+      if (!Array.isArray(res?.revisions)) throw new Error("Некорректный ответ истории IPsec")
       setRevisions(res.revisions)
     } catch (err) {
-      toast.error("Не удалось загрузить историю", { description: String(err) })
-      setRevisions([])
+      if (epoch !== historyEpoch.current) return
+      setHistoryError(err instanceof Error ? err.message : "Не удалось загрузить историю")
     } finally {
-      setHistoryLoading(false)
+      if (epoch === historyEpoch.current) setHistoryLoading(false)
     }
   }, [isLive, historyServerId, backendUrl])
 
@@ -884,7 +892,9 @@ export default function IpsecPage() {
 
       <ConfigHistorySheet
         open={historyOpen}
-        onOpenChange={setHistoryOpen}
+        onOpenChange={v => { if (!v) historyEpoch.current += 1; setHistoryOpen(v) }}
+        loadError={historyError}
+        onRetry={() => void loadRevisions()}
         revisions={revisions}
         loading={historyLoading}
         restoring={historyRestoring}