Goal

Fix the resubscription logic so that after the coordinator socket reconnects, active calls are correctly resubscribed and coordinator events are received again.

Implementation

1. Reset the connectionId whenever the connection is either disconnected or transitioning to a connecting state.
2. Ensure the coordinator socket processes all tasks serially by using Dispatchers.limitedParallelism(1).

Testing

1. Open the demo app.
2. Start a new call.
3. Toggle the internet on and off.
4. Send a reaction — it should appear as expected.
5. Repeat steps 3 and 4; the behavior should remain consistent.