feat(admin): live active-work view (5s refresh)

apps/admin/src/api/admin-sessions.ts

@@ -0,0 +1,13 @@
+import { useQuery } from '@tanstack/react-query';
+import type { WorkSession } from '@solelog/shared';
+import { apiFetch } from '../lib/api';
+
+// Active work sessions across all workers (admin cross-user view).
+// Polls every 5s so the Live view reflects who is working without a manual refresh.
+export function useActiveSessions() {
+  return useQuery({
+    queryKey: ['admin', 'sessions', 'active'],
+    queryFn: () => apiFetch<WorkSession[]>('/api/admin/sessions/active'),
+    refetchInterval: 5000,
+  });
+}