Push notifications go missing on the macOS web app

[Styry]

Setup: Campfire 1.5.6 installed as a web app on macOS (Safari 26.5), plus an iPhone. Messages come from a bot. The iPhone got every push. The Mac often got none, while Apple returned 201 for every delivery. I found three separate causes.

1. A minimized window stays present after a reconnect. With the window minimized, the membership's connected_at kept updating every ~50 s, so no push was sent to any device. Subscribing to PresenceChannel marks the member present (on_subscribe :present), and #websocketConnected starts the refresh timer without checking visibility, so after a reconnect nothing sends absent. Fix: in #websocketConnected, start the timer only when visible, otherwise send absent.

2. The service worker calls waitUntil after an await.

self.addEventListener("push", async (event) => {
  const data = await event.data.json()
  event.waitUntil(Promise.all([ showNotification(data), updateBadgeCount(data.options) ]))
})

waitUntil has to be called while the event is dispatched, and here the notification also fails if the badge update fails. With the app closed it worked; with the app open the notification didn't show. Calling waitUntil synchronously and showing the notification before the badge fixed that:

self.addEventListener("push", (event) => {
  const data = event.data.json()
  event.waitUntil(showNotification(data).finally(() => updateBadgeCount(data.options).catch(() => {})))
})

3. Updating the badge from the page removes the notification. After the fix above, the notification appeared and disappeared within a second. The open page gets the same message over the cable at that moment and badge_dot_controller calls setAppBadge/clearAppBadge, and macOS took the notification away. Updating the badge from the page only while the window is focused, and recounting on focus, fixed it. While unfocused the push already sets the badge.

We also treat an unfocused window as away for presence (document.hasFocus()), so switching to another app gets you pushes. That one is more of a preference.

Patches are small, happy to open PRs for any of these.