feat: wire dashboard v2 to backend data

frontend/src/layouts/NexusLayout.vue

@@ -7,12 +7,12 @@
  */
 import { ref } from 'vue'
 import { RouterView } from 'vue-router'
-import { useAgentStore } from '../stores/agents'
+import { useDashboardStore } from '../stores/dashboard'
 import GalaxyBackground from '../components/background/GalaxyBackground.vue'
 import Sidebar from '../components/layout/Sidebar.vue'
 import Topbar from '../components/layout/Topbar.vue'
 
-const agentStore = useAgentStore()
+const dashboardStore = useDashboardStore()
 
 /* ── Mobile Sidebar State ───────────────────────── */
 const mobileMenuOpen = ref(false)
@@ -39,7 +39,8 @@ function closeMobileMenu() {
 
     <main class="nexus-main">
       <Topbar
-        :connected="agentStore.isConnected"
+        :connected="dashboardStore.isGatewayConnected"
+        :status-label="dashboardStore.irisStatusLabel"
         @toggle-sidebar="mobileMenuOpen = !mobileMenuOpen"
       />
       <div class="nexus-content">