Read each schedule's production status once a minute

Every content schedule row on the Schedule page asked the engine for its
production status every 5s while a plan was running, a steady stream of
/content requests during production. Read it once a minute; starting a
production still refreshes it at once.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

src/pages/Schedule.tsx

@@ -151,11 +151,13 @@ function ScheduleRow({ schedule, owners }: { schedule: Schedule; owners?: Owners
   )
 }
 
-// Content schedules report this week's progress from the engine's production period.
+// Content schedules report this week's progress from the engine's production period. Each row
+// asks for its own, so it is read once a minute; starting a production refreshes it at once.
 const useProduction = (agentId: number) => useQuery({
   queryKey: ['production', agentId],
   queryFn: () => productionStatus(agentId),
-  refetchInterval: q => (q.state.data?.plans.some(p => PLAN_ACTIVE.has(p.status)) ? 5000 : 60_000),
+  refetchInterval: 60_000,
+  staleTime: 60_000,
 })
 
 function ProductionLine({ agentId, active }: { agentId: number; active: boolean }) {