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iOS suspends JS and closes the SSE connection when the PWA is backgrounded. The existing visibility heuristic skipped reconnect because the last event was recent right before suspension, leaving the session frozen. Force-reconnect on visibility/pageshow, detect successful reconnects via repeated server.connected, and resync the active session messages so events emitted during the gap are recovered.
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Issue for this PR
Closes #17769
Type of change
What does this PR do?
When the web app runs as a PWA on iOS and is backgrounded, Safari suspends JS and quietly closes the SSE connection. On resume the existing visibility heuristic skipped reconnect because the last event timestamp was within the heartbeat window right before suspension, so the session UI stayed frozen until the user manually refreshed.
Changes:
How did you verify your code works?
Manual: installed the web app to home screen on iOS, started a streaming session, switched apps for ~30s, returned — the stream resumes and the session catches up without a refresh.
Automated:
Screenshots / recordings
N/A — no UI surface changed.
Checklist