Say what "even when ihasmail is closed" actually means

Web Push works, confirmed end to end against the live 0.16.19: with
Chrome open and every ihasmail tab closed, a notification arrives
immediately and names the sender and subject.

But "closed" means ihasmail, not the browser, and the switch did not say
so. Web Push is delivered over a connection the browser holds, so
something of it has to be running.

Observed on 2026-08-26, with Chrome fully quit and "Continue running
background apps" off: nothing arrived until Chrome was started again, at
which point the queued notification was delivered. Turning that setting
on keeps a process alive and restores immediate delivery.

Worth knowing that the queue is not indefinite -- a Web Push message
carries a TTL, and one that expires before the browser comes back is
dropped rather than delivered late. Being an installed PWA does not
change any of this on a desktop; it changes the window, not who holds
the connection. On Android it would, since the push service can wake the
browser from cold.

None of this is ihasmail's to fix. It is what Web Push is, and the only
thing worth doing about it is not implying otherwise -- which the
notification switch was quietly doing.

web/src/views/settings/NotificationsSettings.tsx

@@ -71,8 +71,8 @@ export function NotificationsSettings() {
           !canBackground
             ? "Needs a browser with the Push API and a mail server that publishes a push key."
             : supportsEmailPush()
-              ? "Your mail server delivers these directly to your browser, so they arrive with no tab open. The sender and subject travel in the notification."
-              : "Your mail server can wake this browser, but will not include the sender or subject."
+              ? "Your mail server delivers these straight to your browser, so they arrive with no ihasmail tab open, naming the sender and subject. Your browser still has to be running — if you quit it completely, notifications wait and arrive when you open it again."
+              : "Your mail server can wake this browser, but will not include the sender or subject. Your browser still has to be running."
         }
       />
       <Switch checked={s.notificationSound} onChange={(v) => update({ notificationSound: v })} label="Play a sound for new mail" />