- add `Connected()` method for client
- add `LastErr` field to GoTomatoClient
- replace error logging by updating `LastErr` field
- modify methods to use pointer receivers for Client
- add `prevMessage` variable to store the last received server message
- show connect status in TUI
- use EnterAltScreen instead of ClearScreen
- add new websocket.Client type
- change Connect and Disconnect functions to use the new Client type
- implement methods for sending commands and updating settings on Client
- update keyhandler to use websocket.Client instead of ChronoTomato.Client
- modify UpdateLoop to accept websocket.Client
- refactor ProcessServerMessages to accept the new Client type
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