fix(traffic): проверять live-срез и прекращать опрос выключенных устройств

components/traffic/traffic-data-time.tsx

@@ -1,9 +1,10 @@
 /** Receipt time is not the timestamp of a network measurement. */
-export function TrafficDataTime({ label, receivedAt, source, serverAt }: {
+export function TrafficDataTime({ label, receivedAt, source, serverAt, serverTimeLabel = "метка сервера" }: {
   label: string
   receivedAt?: number | null
   source: "API" | "live-поток"
   serverAt?: string
+  serverTimeLabel?: string
 }) {
   if (receivedAt == null || !Number.isFinite(receivedAt)) return null
   const date = new Date(receivedAt)
@@ -11,7 +12,7 @@ export function TrafficDataTime({ label, receivedAt, source, serverAt }: {
     <p aria-label={label} className="text-xs text-muted-foreground mb-3 break-words">
       Получено ({source}): <time dateTime={date.toISOString()}>{date.toLocaleString("ru-RU")}</time>
       {serverAt && Number.isFinite(Date.parse(serverAt))
-        ? <> · метка сервера: <time dateTime={serverAt}>{new Date(serverAt).toLocaleString("ru-RU")}</time></>
+        ? <> · {serverTimeLabel}: <time dateTime={serverAt}>{new Date(serverAt).toLocaleString("ru-RU")}</time></>
         : " · время измерения не предоставлено"}
     </p>
   )