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BackendConnection's ConnectionState enum is now Connecting / Online / Reconnecting / Offline (PLAN.md §5). The probe loop tracks the first failure since the last Online and transitions to Reconnecting on any failed probe, then to Offline once the configurable threshold (30 s default) is exceeded. The Error state is gone; Reconnecting + the exposed `error` string subsume its UI role. ReactiveListModel is the headline QML type: - QAbstractListModel that GETs `baseUrl + source` for an initial JSON array and then keeps in sync via an internal MercureClient subscribed to `topic`. - Role names are derived dynamically from the first row's keys plus an internal `pending` boolean role used by optimistic mutations. - Diff application: upsert (insert-or-update), delete, replace; gap detection via the envelope `version` field with auto re-fetch. - `invoke(method, path, body, optimistic)` is the optimistic command primitive. Generates an Idempotency-Key, applies the local diff, POST/PATCH/DELETEs with that key, and resolves on the matching Mercure echo (correlation-key matched in ModelPublisher's envelope). Rolls back and emits commandFailed on 4xx/5xx, commandTimedOut after 10 s without an echo. Phase 4 packaging will surface configuration for the timeout. AppShell.qml is the optional convenience root: - Reads BackendConnection.connectionState. - Reconnecting → top banner. - Offline → modal overlay with the error string and a Retry button (calls BackendConnection.restart()). - Wraps user content via `default property alias content`. Apps that want full chrome control can skip AppShell entirely; the skeleton's Main.qml keeps its own status display for demonstration and is unaffected. ReactiveObject (single-entity twin of ReactiveListModel) is intentionally deferred — same envelope handling, smaller surface; will land in Phase 2 follow-up or Phase 3 alongside the todo example. Cursor pagination is similarly deferred (the Phase 2 done criterion uses small lists). Smoke tested: /healthz + /api/ping round-trip cleanly, zero Mercure 401s, clean shutdown. composer quality stays green (16 tests, 45 assertions). Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>