Global refresh rate in Settings drives every live view and each machine's sampler; per-page pickers removed

Co-Authored-By: Claude Fable 5.1 <noreply@anthropic.com>

web/src/Cron.tsx

@@ -2,6 +2,7 @@ import { useCallback, useEffect, useRef, useState } from 'react'
 import { api, CronJob, CronOverview, CronRun, CronTimer, LogEntry } from './api'
 import { Logs } from './Services'
 import { Btn, Loading, Spinner, toast } from './ui'
+import { LIST_FLOOR, useRefreshMs } from './prefs'
 
 const fmtTime = (ms: number) => { const d = new Date(ms); return d.toLocaleDateString(undefined, { weekday: 'short', month: 'short', day: '2-digit' }) + ' ' + d.toLocaleTimeString([], { hour: '2-digit', minute: '2-digit' }) }
 function rel(ms: number): string {
@@ -180,8 +181,9 @@ export default function Cron() {
   const load = useCallback(async () => {
     try { setOv(await api.cron()); setErr('') } catch (e) { setErr(e instanceof Error ? e.message : 'failed') }
   }, [])
+  const rate = useRefreshMs(LIST_FLOOR)
   useEffect(() => { load() }, [load])
-  useEffect(() => { const t = setInterval(() => { if (document.visibilityState === 'visible') load() }, 30000); return () => clearInterval(t) }, [load])
+  useEffect(() => { const t = setInterval(() => { if (document.visibilityState === 'visible') load() }, rate); return () => clearInterval(t) }, [load, rate])
 
   const needle = q.trim().toLowerCase()
   const match = (...s: string[]) => !needle || s.some((x) => x.toLowerCase().includes(needle))