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* feat(dashboard): surface metrics-paused indicator after sustained poll failure useDashboardData previously failed silently when /stats or /system/stats returned an error: stale data kept rendering and the last sync timestamp quietly drifted. The operator could not tell whether the dashboard was just slow or whether the Docker socket / metrics path had genuinely gone down. Track consecutive failures per live-metrics endpoint. After three in a row on either /stats or /system/stats (≈15 s at the 5 s poll cadence), expose a metricsStale boolean on the hook result. HealthStatusBar renders a small amber "metrics paused" chip beside the meta line when set. The indicator clears on the first successful response when both endpoints are within the threshold. A unit test for the threshold logic is intentionally deferred to the Phase 4 E2E dashboard spec, which exercises the same path end-to-end by stopping the Docker daemon and asserting the user-visible indicator. * fix(dashboard): rename stale-metrics chip and cover the threshold with tests Address two follow-up findings from independent review of the earlier commit on this branch. 1. Rename the masthead chip from "metrics paused" to "metrics stale". The hook keeps polling on every cycle; the chip describes the freshness of the displayed numbers, not the polling cadence. The new wording matches the underlying `metricsStale` state variable. 2. Add a Vitest spec for the threshold logic. Captures the visibilityInterval callback at registration time and drives each polling cycle on demand, covering: three consecutive /stats failures trip the indicator and the next successful poll clears it; three consecutive /system/stats failures trip the indicator on the other endpoint; clearing requires both endpoints under threshold (a single endpoint recovering while the other is still failing keeps the indicator set). The clarifying comment in useDashboardData notes that polling is unaffected and only the data freshness is in scope, so future readers do not interpret "stale" as "paused".