Event stream (SSE) doesn't resume after tab is backgrounded and restored — requires manual page refresh #47258

Description

In packages/app/src/context/server-sdk.tsx, pagehide always calls stop() on the event stream (lines ~325-328), but pageshow only calls start() again if event.persisted === true (resumeStreamAfterPageShow, lines 162-165).

Since the event stream itself is an open streaming fetch() connection, it is a known bfcache blocker in most browsers — meaning the page is often not bfcache-eligible, so persisted comes back false on pageshow, and start() is never called.

Result: After backgrounding/returning to the tab (switching apps, locking screen, etc.), the live event stream stays dead and the UI stops reflecting session updates until a full manual page refresh remounts the app.

Confirmed as web-UI-specific: OpenChamber (a third-party client using the same server API/event stream) does not exhibit this issue — server side is fine.

Relevant code:

// lines 162-165
export function resumeStreamAfterPageShow(event: PageTransitionEvent, start: () => unknown) {
  if (!event.persisted) return
  start()
}

// lines 325-328 (onMount)
makeEventListener(window, "pagehide", stop)
makeEventListener(window, "pageshow", (event) => resumeStreamAfterPageShow(event, start))

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