docs(performance): scope the stream-stats sampler to its open popover

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

docs/architecture/idle-work-audit-2026-09.md

@@ -198,7 +198,8 @@ user who leaves that screen open pays them indefinitely, minimized included.
 | [epg-refresh-coordinator.service.ts:82](../../libs/portal/xtream/feature/src/lib/portal-channels-list/epg-refresh-coordinator.service.ts) | Xtream live: refreshes stale visible or tracked EPG entries | 60 s while live lists are registered | Xtream HTTP through main for stale entries only | Yes (already scoped) | Static | Pause on hidden once throttling allows it. |
 | [stalker-watchdog.controller.ts:188](../../libs/portal/stalker/data-access/src/lib/stalker-watchdog.controller.ts) | Stalker `get_events` keep-alive | Portal `watchdog_timeout` (default 120 s) | A playlist row read and one portal HTTP request | Yes (portal protocol) | Static | None |
 | [downloads.component.ts:223](../../libs/portal/downloads/feature/src/lib/downloads.component.ts), [recording-queue.component.ts:88](../../libs/portal/downloads/feature/src/lib/recording-queue.component.ts) | Recordings reload and elapsed-time tick | 15 s / 1 s while recordings are active and the page is open | `loadRecordings()` IPC and SQL / CD tick | **Partly.** Downloads are already push-based, so recordings could be too. | Static | **Own thread.** Push recording state like `onDownloadsUpdate`. |
-| [controls-stream-stats.ts:42](../../libs/ui/playback/src/lib/player-controls/controls-stream-stats.ts) and 30 s EPG clocks in the Xtream, Stalker, EPG guide and unified live views | Stats sampling and "now" clocks | 1 s / 30 s on their routes | CD tick each | Yes while visible | Static | Cover with the throttling thread (pause on hidden). |
+| [controls-stream-stats.ts:42](../../libs/ui/playback/src/lib/player-controls/controls-stream-stats.ts) | Stream-info sampling | 1 s, only while the stream-info popover is open; `stop()` clears it when the popover closes | CD tick each | Yes (a closed popover costs nothing) | Static | None |
+| 30 s EPG clocks in the Xtream, Stalker, EPG guide and unified live views | "Now" clocks for progress and the current programme | 30 s for as long as their route is open | CD tick each | Yes while visible | Static | Cover with the throttling thread (pause on hidden). |
 
 ## Related observation