fix(useWebsocket): pongTimeout auto-reconnect no work

[shanyi-front]

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Description

When I attempted to use the useWebsocket hook from VueUse in my project, I noticed during testing that it doesn't automatically reconnect when a heartbeat pong times out.

Additional context

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🤖 Generated by Copilot at ac3fb07

Fix a bug in useWebSocket that prevented automatic reconnection after an error. Reset the explicitlyClosed flag when the connection is opened.

🤖 Generated by Copilot at ac3fb07

• Fix a bug where the WebSocket connection would not be reopened automatically after an error if the user had previously closed it manually (link)