fix(backups): сохранять неизвестный результат восстановления

lib/use-backup-restore-guard.ts

@@ -0,0 +1,32 @@
+"use client"
+import { useEffect, useRef, useState } from "react"
+import { backupRestoreCheckpointSchema, backupRestoreStorageKey, readBackupRestoreCheckpoint, type BackupRestoreCheckpoint } from "./backup-restore-checkpoint"
+export function useBackupRestoreGuard(backendUrl: string, live: boolean) {
+ const [checkpoint, setCheckpoint] = useState<BackupRestoreCheckpoint | null>(null), current = useRef<BackupRestoreCheckpoint | null>(null)
+ const [hydrated, setHydrated] = useState(false), [error, setError] = useState<string | null>(null), blocked = useRef(false), alive = useRef(true)
+ const key = backupRestoreStorageKey(backendUrl)
+ useEffect(() => {
+  alive.current = true
+  queueMicrotask(() => {
+   if (!alive.current) return
+   try { const saved = live ? readBackupRestoreCheckpoint(sessionStorage.getItem(key)) : null; current.current = saved; setCheckpoint(saved) }
+   catch { blocked.current = true; setError("Не удалось прочитать отметку импорта. Проверьте состояние роутера перед новым восстановлением") }
+   setHydrated(true)
+  })
+  return () => { alive.current = false }
+ }, [key, live])
+ function begin(target: Omit<BackupRestoreCheckpoint, "requestedAt">) {
+  if (!live || !hydrated || !alive.current || blocked.current || current.current) return false
+  const value = backupRestoreCheckpointSchema.parse({ ...target, requestedAt: new Date().toISOString() })
+  try { sessionStorage.setItem(key, JSON.stringify(value)) }
+  catch { blocked.current = true; setError("Не удалось сохранить отметку импорта. Запрос не отправлен"); return false }
+  current.current = value; setCheckpoint(value); return true
+ }
+ function clear() {
+  if (!live || !hydrated || !alive.current) return false
+  try { sessionStorage.removeItem(key) }
+  catch { blocked.current = true; setError("Не удалось очистить отметку импорта. Новый импорт заблокирован"); return false }
+  current.current = null; blocked.current = false; setCheckpoint(null); setError(null); return true
+ }
+ return { checkpoint, hydrated, error, begin, clear, canStart: hydrated && !checkpoint && !error }
+}