fix(ui): различать ошибки и пустую историю WireGuard

app/(main)/wireguard/page.tsx

@@ -46,6 +46,7 @@ import {
   exportWireGuard,
   importWireGuard,
   listWireGuard,
+  listWireGuardRevisions,
   patchWireGuardInterface,
 } from "@/shared/api/wireguard"
 import type { WgIfaceDto } from "@mmapp/contracts/wireguard"
@@ -211,6 +212,9 @@ function WireGuardPageContent({ selectedServerId, selectedInterfaceId, allInterf
   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)
+  useEffect(() => () => { historyEpoch.current += 1 }, [])
   const restoreLock = useRef(false)
   const [historyRestoring, setHistoryRestoring] = useState(false)
   const [liveExport, setLiveExport] = useState<{
@@ -272,18 +276,18 @@ function WireGuardPageContent({ selectedServerId, selectedInterfaceId, allInterf
 
   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/wireguard/revisions?serverId=${encodeURIComponent(historyServerId)}`,
-      )
-      setRevisions(res.revisions)
-    } catch (err) {
-      toast.error("Не удалось загрузить историю", { description: String(err) })
-      setRevisions([])
+      const revisions = await listWireGuardRevisions(backendUrl, historyServerId)
+      if (epoch !== historyEpoch.current) return
+      setRevisions(revisions)
+    } catch (error) {
+      if (epoch !== historyEpoch.current) return
+      setHistoryError(error instanceof Error ? error.message : "Не удалось загрузить историю")
     } finally {
-      setHistoryLoading(false)
+      if (epoch === historyEpoch.current) setHistoryLoading(false)
     }
   }, [isLive, historyServerId, backendUrl])
 
@@ -990,7 +994,9 @@ function WireGuardPageContent({ selectedServerId, selectedInterfaceId, allInterf
 
       <ConfigHistorySheet
         open={historyOpen}
-        onOpenChange={setHistoryOpen}
+        onOpenChange={v => { if (!v) historyEpoch.current += 1; setHistoryOpen(v) }}
+        loadError={historyError}
+        onRetry={() => void loadRevisions()}
         title="История WireGuard"
         itemLabel="интерфейсов"
         revisions={revisions}