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/Shell.tsx

@@ -14,6 +14,7 @@ import Machines from './Machines'
 import Settings from './Settings'
 import MachineSwitcher from './MachineSwitcher'
 import { MachineStatus, setMachine } from './api'
+import { LIST_FLOOR, useRefreshMs } from './prefs'
 import Power from './Power'
 import { Btn, Toasts, toast } from './ui'
 
@@ -52,6 +53,7 @@ export default function Shell({ me: hubMe, onLoggedOut }: { me: Me; onLoggedOut:
   const [remoteMe, setRemoteMe] = useState<Me | null>(null)
   const [remoteErr, setRemoteErr] = useState('')
   const me: Me = machine ? (remoteMe ?? { ...hubMe, host: machine, load: '', version: '…', uptime: 0, reboot_needed: false }) : hubMe
+  const listRate = useRefreshMs(LIST_FLOOR)
   const [terms, setTerms] = useState<Term[]>([])
   const [active, setActive] = useState<string | null>(null)
   const [view, setView] = useState<View>('dashboard')
@@ -72,7 +74,7 @@ export default function Shell({ me: hubMe, onLoggedOut }: { me: Me; onLoggedOut:
 
   // Machine list for the switcher (hub-local), refreshed while the console is open.
   const loadMachines = useCallback(async () => { try { setMachines((await api.machines()).nodes) } catch { /* not a hub or offline */ } }, [])
-  useEffect(() => { loadMachines(); const t = setInterval(loadMachines, 15000); return () => clearInterval(t) }, [loadMachines])
+  useEffect(() => { loadMachines(); const t = setInterval(loadMachines, Math.max(listRate, 5000)); return () => clearInterval(t) }, [loadMachines, listRate])
 
   // Switching machines: reset everything that belongs to a host, then re-fetch its identity.
   const switchMachine = (name: string | null) => {
@@ -86,9 +88,9 @@ export default function Shell({ me: hubMe, onLoggedOut }: { me: Me; onLoggedOut:
     let stop = false
     const tick = async () => { try { const m = await api.me(); if (!stop) { setRemoteMe(m); setRemoteErr('') } } catch (e) { if (!stop) setRemoteErr(e instanceof Error ? e.message : 'unreachable') } }
     tick()
-    const t = setInterval(tick, 30000)
+    const t = setInterval(tick, Math.max(listRate, 5000))
     return () => { stop = true; clearInterval(t) }
-  }, [machine])
+  }, [machine, listRate])
 
   async function create() {
     setCreating(true)