fix(ui): распознавать CRLF и комментарии в потоке SSE

tests/e2e/traffic-live.spec.ts

@@ -1,4 +1,4 @@
-import { installOpenLiveStream, resumeLiveStream } from "./live-stream-fixture"
+import { installOpenLiveStream, resumeLiveStream, sendLiveHeartbeat } from "./live-stream-fixture"
 import { test, expect } from '@playwright/test'
 
 for (const variant of ['closed', 'invalid', 'http-error', 'silent'] as const) {
@@ -32,7 +32,9 @@ for (const variant of ['closed', 'invalid', 'http-error', 'silent'] as const) {
     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 page.clock.fastForward(10_000)
+      await sendLiveHeartbeat(page)
+      await page.clock.fastForward(5_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!)