fix(mobile): probe socket liveness on resume - #5118
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Detect half-open WebSocket sessions after short app background periods with a bounded REQ/EOSE probe. Reconnect and replay live subscriptions when the probe times out or errors. Co-authored-by: Aiden Almazan <aiden.almazan1228@gmail.com> Signed-off-by: Aiden Almazan <aiden.almazan1228@gmail.com>
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Summary
Why
iOS can suspend or rebind the network without delivering a close frame. Buzz then still reports the relay session as connected while new messages remain invisible until the app is force-closed.
Verification
flutter analyzerelay_session_test.dartsuiteThis is the signed replacement for #4963, whose source commit lacks the required DCO trailer.