fix(ui): снимать статус live при отсутствии обновлений

tests/e2e/traffic-live.spec.ts

@@ -1,6 +1,7 @@
+import { installOpenLiveStream, resumeLiveStream } from "./live-stream-fixture"
 import { test, expect } from '@playwright/test'
 
-for (const variant of ['closed', 'invalid', 'http-error'] as const) {
+for (const variant of ['closed', 'invalid', 'http-error', 'silent'] as const) {
   test(`Трафик: SSE ${variant} не выдаёт старое измерение за live`, async ({ page }) => {
     const server = { id: '1', name: 'Тестовый сервер', site: 'TEST', country: 'RU', status: 'online', rxNow: 2, txNow: 3, rxPeak: 5, txPeak: 6, rxTotal: 100, txTotal: 200, sessions: 1, rxSeries: [1, 2], txSeries: [2, 3] }
     await page.route('**/health', route => route.fulfill({ json: { ok: true } }))
@@ -22,11 +23,26 @@ for (const variant of ['closed', 'invalid', 'http-error'] as const) {
         : path === '/api/servers' ? [] : {}
       return route.fulfill({ json })
     })
+    if (variant === 'silent') await installOpenLiveStream(page, '/api/traffic/servers/1/live', { rxMbps: 17, txMbps: 19, at: '2026-09-23T12:00:00Z' })
     const received = new Date('2026-09-28T06:00:00Z')
     await page.clock.setFixedTime(received)
     await page.goto('/traffic')
     const summary = page.getByLabel('Скорость выбранного сервера')
     await expect(summary).toBeVisible()
+    if (variant === 'silent') {
+      await expect(summary.getByText('live', { exact: true }).filter({ visible: true })).toHaveCount(2)
+      const stamp = await page.getByLabel('Последнее измерение сервера').locator('time').first().getAttribute('datetime')
+      await page.clock.fastForward(15_001)
+      await expect(summary.getByText('live', { exact: true })).toHaveCount(0)
+      await expect(summary).toContainText('17.0')
+      await expect(page.getByLabel('Последнее измерение сервера').locator('time').first()).toHaveAttribute('datetime', stamp!)
+      await resumeLiveStream(page)
+      await expect(summary.getByText('live', { exact: true }).filter({ visible: true })).toHaveCount(2)
+      await page.getByRole('group', { name: 'Разделы трафика' }).getByRole('button', { name: 'Клиенты', exact: true }).click()
+      await page.clock.fastForward(15_001)
+      await expect(page.getByLabel('Последнее измерение сервера')).toHaveCount(0)
+      return
+    }
     const hint = variant === 'http-error' ? 'История · live недоступен' : 'Последнее live-измерение · поток недоступен'
     await expect(summary.getByText(hint, { exact: true }).filter({ visible: true })).toHaveCount(2)
     await expect(summary.getByText('live', { exact: true })).toHaveCount(0)