fix(dashboard): add 90s auto-refresh to overview page

dashboard/src/app/(dashboard)/page.tsx

@@ -14,6 +14,7 @@ import { LiveActivity } from '@/components/overview/live-activity';
 import { SystemHealth } from '@/components/overview/system-health';
 import { MetricCards } from '@/components/overview/metric-cards';
 import { AgentStatusGrid } from '@/components/overview/agent-status-grid';
+import { AutoRefresh } from '@/components/overview/auto-refresh';
 
 export const dynamic = 'force-dynamic';
 
@@ -67,6 +68,7 @@ export default async function OverviewPage({
 
   return (
     <div className="space-y-6">
+      <AutoRefresh />
       {/* Header */}
       <div className="flex items-center justify-between">
         <div>

dashboard/src/components/overview/auto-refresh.tsx

@@ -0,0 +1,17 @@
+'use client';
+
+import { useEffect } from 'react';
+import { useRouter } from 'next/navigation';
+
+const REFRESH_INTERVAL_MS = 90_000; // 90s — fast enough to catch cron heartbeats, light on server
+
+export function AutoRefresh() {
+  const router = useRouter();
+
+  useEffect(() => {
+    const id = setInterval(() => router.refresh(), REFRESH_INTERVAL_MS);
+    return () => clearInterval(id);
+  }, [router]);
+
+  return null;
+}