Silent transport drop shows "Quiet" (idle) instead of "Offline"

[aasis21]

Problem

The watchdog (sessionManager.startWatchdog) only flips a live session to idle ("Quiet") after 20s without a heartbeat. If the relay/WebSocket silently drops (no SESSION_END), heartbeats simply stop and the session is shown as "Quiet" rather than "Offline" — misleading, since it's actually disconnected.

Suggested fix

Detect transport disconnects (socket close/error) and reflect a true offline/error status; distinguish "agent idle but connected" from "we lost the connection".

Where

mobile/src/lib/sessionManager.ts (startWatchdog, ~416–431).

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Filed from a UI research sweep of the Helm mobile app (landing + live demo session) using Playwright + full source review, cross-referenced against Claude, ChatGPT, GitHub Copilot Chat, and Codex/Claude Code UIs.

[aasis21]

Fixed on \main\ in commit 4262060 as part of the P1 UI sweep (wave 1). This issue was implemented but not auto-closed because GitHub only honors the closing keyword before the first issue in a multi-issue \Closes\ line.

[aasis21]

Follow-up: the robust root-cause fix landed in 434fa68.

The earlier close addressed the symptom via the heartbeat watchdog (flip to Offline after ~45s of missed beats). That commit adds true transport-drop detection so the flip is immediate:

• The Supabase Realtime status callback (which keeps firing CHANNEL_ERROR / TIMED_OUT / CLOSED on a drop and SUBSCRIBED on rejoin) is now surfaced end-to-end via a new optional Transport.onStatus → SecureChannel.onStatus → HelmClient.onStatus.
• sessionManager subscribes on attach: a live-connection drop flips the session to Offline at once (and unsticks a stale Stop control); a rejoin restores Live and re-pulls the authoritative state snapshot.
• A first-connect failure still rejects the connect (no phantom "disconnected"); events from a superseded client are ignored; demo/ended sessions are skipped. The 45s watchdog remains as the backstop for drops that surface no socket event.

Covered by 6 new shared tests (transport-supabase + roundtrip onStatus).