- src/live/last-seen.ts: formatLastSeen(ts, now) — "now" / "Ns ago" /
"Nm ago" / "HH:MM".
- src/live/use-staleness.ts: useStalenessTick(intervalMs=1000) hook
re-renders subscribers every interval with the current epoch ms.
- src/ui/components/connection-chip.tsx: <ConnectionChip /> bottom-left,
three states (connected / connecting+reconnecting / disconnected),
aria-live polite + role status.
- src/map/layers/map-positions.tsx: every FeatureProps now carries
staleSec; both symbol layers interpolate icon-opacity (and text-opacity
on the non-selected layer) on staleSec — 0-60s full opacity,
5min faded, 30min very faded. Update effect rebuilds features at the
staleness tick rate (1Hz).
- src/routes/_authed/monitor.tsx: renders <ConnectionChip />.
- src/live/index.ts: re-exports formatLastSeen + useStalenessTick.
Strategy A (faded marker via interpolation) chosen over Strategy B
(separate warning-badge layer) per the task's open-question
resolution; simpler and easier to extend later.
Deviations:
1. stalenessTick is its own hook in src/live/use-staleness.ts rather
than a property on the position store — keeps the store clean of
UI-driven re-render concerns; the hook is reusable.
2. <DeviceLastSeen deviceId> standalone component skipped — the SPA
doesn't have a sidebar yet (Phase 3.4); the per-marker fade IS the
indicator for v1.
Bundle: main 396KB / 121KB gz — small bump from 2.8.
🎉 Phase 2 — Live monitoring map — complete. All 9 tasks shipped.
End-to-end: login -> /monitor -> event auto-selects -> snapshot
positions render -> live updates flow via WS through the rAF
coalescer -> staleness fades stale markers -> connection chip
surfaces WS state. Dogfood-blocking work for Rally Albania 2026 done.
julian
ed88f1767d