fix(ui): показывать свежесть срезов Firewall

lib/firewall-freshness.ts

@@ -0,0 +1,14 @@
+import { matchesFirewallFailure, type FirewallFailure } from "./firewall-response"
+
+export type FirewallSliceTime = { serverId: string; family: "ip" | "ip6"; table: string; receivedAt: string | null }
+export function updateFirewallSliceTimes(previous: FirewallSliceTime[], serverIds: string[], failures: FirewallFailure[], receivedAt: string): FirewallSliceTime[] {
+  return serverIds.flatMap(serverId => (["ip", "ip6"] as const).flatMap(family => ["filter", "nat", "mangle", "raw", "address-list"].map(table => {
+    const slice = { serverId, family, table }
+    const old = previous.find(row => row.serverId === serverId && row.family === family && row.table === table)
+    return { ...slice, receivedAt: failures.some(f => matchesFirewallFailure(f, slice)) ? old?.receivedAt ?? null : receivedAt }
+  })))
+}
+export function firewallTimeRange(slices: FirewallSliceTime[]) {
+  const times = slices.flatMap(slice => slice.receivedAt ? [slice.receivedAt] : []).sort()
+  return { oldest: times[0], newest: times.at(-1), unknown: slices.filter(slice => !slice.receivedAt).length }
+}