Keep Now live when device details stop updating

[frahlg]

When /api/status fails while telemetry keeps arriving, Now leaves old device watts under a live display. This change switches the diagram to fresh telemetry totals after a failed read or 15 seconds without a usable reply. It clears old device and daily-share labels, dates retained energy and fuse readings, and restores the details when status recovers.

Status polling stops when Now is hidden or the session ends. An expired EV overlay also stops overriding telemetry.

Validation:

• Browser check on bf27cc06c32ee8494e69ec73ab6d081aaf5df58f, using a local SimBox fixture that fails only /api/status: healthy → HTTP 503 with telemetry continuing → recovery without a reload. The diagram kept moving, the daily share disappeared, energy and Fuse showed Last known with a timestamp, and fresh labels and values returned on recovery.
• Viewed the changed states at 1280×720 and 390×844. The mobile note and timestamps fit without horizontal overflow.
• Regression tests fail before the fixes and pass afterward, including the rendered daily-share label. Tests cover a pending request, a backwards clock change, recovery and a reply arriving after the watcher stops.
• Type checks, the full suite with two workers (1,022 passed, 1 skipped), and the production build pass. Entry JavaScript is about 76 kB gzip, below the 90 kB CI limit.

Browser evidence uses simulated data. Physical box behavior has not been tested for this change.

---

Note

Medium Risk
Changes live-display honesty and fallback logic on the primary Now screen when status and telemetry disagree; mistakes could mislabel power flow or fuse safety readings.

Overview
When /api/status fails or goes quiet while the 1 Hz stream still runs, Now no longer keeps drawing stale per-device details as if they were live.

Status polling now emits a StatusSnapshot with a 15s freshness window (elapsed time via timers, not wall clock). Failed reads, overdue replies, or stop/hide mark the retained snapshot stale instead of silently reusing it.

On stale status, the energy-flow hero switches to telemetry totals, explicitly clears self-powered today, and shows a short “Device details are out of date” note while particles can still move. Today and Fuse in Outlook switch to Last known / Last totals copy with last-updated timestamps until status recovers.

The EV charger overlay reports 0 W when loadpoints data is stale so it cannot override fresh telemetry. Status watching is limited to when Now is active, visible, and streaming with API passthrough.

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Review	Status	Commit	Review trigger
📝 Code Review	✅ Completed 2026-09-07T18:34:18.412897Z	bf27cc0	Draft marked ready

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