- introduce password flag in server command line options
- update clientCommand model
- add password requirement for controlling the Pomodoro timer
- document password in README
- change "none" to an empty string for the mode field
- update README to reflect the new mode representation
- ensure consistency across session end/reset and welcome messages
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- create a new shared state file to manage message state
- replace broadcast.Message with shared.Message in pomodoro logic
- update websocket client handling to use shared.Clients
- remove unnecessary broadcast imports from various files
- ensure consistent message handling across the application
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