Send InitRequest on dead WebSocket to trigger on_load

[nirben82]

Update the dispatch method to check if the underlying WebSocket is dead before firing a user event. If it is dead, the client:

1. Queues the incoming UserEvent.
2. Sends an InitRequest that both revives the connection and triggers on_load on the server.
3. Allows the existing dequeueEvent logic to safely fire the queued user action once the server finishes its initialization stream.

Fixes #1359

[richard-to]

Overall looks good to me. Just one question which I left as a comment.