Sessions Integration Feature

Nucleic-Session: FC94353F-9F0D-4BCC-AD7C-0FB14E38C2E5
Co-authored-by: Nucleic <[email protected]>

NucleicRemote/NucleicRemote/Models/RemoteStore.swift

@@ -390,11 +390,13 @@ final class RemoteStore: ObservableObject {
                 fiveHour: WireUsageWindow(utilization: 18, resetsAt: Date().addingTimeInterval(2 * 3600)),
                 sevenDay: WireUsageWindow(utilization: 40, resetsAt: nil)),
             statusFeeds: [])
-        demoHosts = [
-            DemoHost(id: "demo-1", name: "Andrew's Mac", sessions: host1Sessions, dashboard: host1Dashboard),
-            DemoHost(id: "demo-2", name: "Studio Mac", sessions: host2Sessions, dashboard: host2Dashboard),
-        ]
-        applyDemoHost(demoHosts[0])
+        // Mesh P3: seed BOTH demo Macs' worlds merged into the flat aggregate, exactly as the app
+        // presents real paired Macs — every host's sessions/projects/to-dos shown together, no
+        // switcher. `demoHandle` then mutates this aggregate directly for the interactive demo.
+        sessions = host1Sessions + host2Sessions
+        dashboard = DashboardSnapshot.merged([host1Dashboard, host2Dashboard])
+        LiveActivityManager.shared.sync(hostName: hostName, sessions: liveSessions)
+        NotificationRouter.shared.updateBadge(needsYouCount)
     }
 
     /// Offline diff fixture (NUCLEIC_DEMO) so the full-patch Diff tab renders without a host.