break: empty Message.Mode when no pomodoro ongoing

- 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

🤖

README.md

@@ -53,7 +53,7 @@ Example:
 The server periodically (every second) sends JSON-encoded messages to all connected clients to update them on the current state of the Pomodoro session.
 These messages contain the following fields:
 
-- mode: Indicates the current phase of the Pomodoro session ("Work", "ShortBreak", "LongBreak", or "none" if no session is running).
+- mode: Indicates the current phase of the Pomodoro session ("Work", "ShortBreak", "LongBreak", or empty if no session is running).
 - session: The current session number (e.g., 1 for the first work session).
 - total_sessions: The total number of sessions for the current Pomodoro cycle (e.g., 4 if the cycle consists of 4 work/break sessions).
 - time_left: The remaining time for the current mode, in seconds (e.g., 900 for 15 minutes).
@@ -62,11 +62,11 @@ These messages contain the following fields:
 
 | Message Type          | Example                                                                                                        | 
 | --------------------- | ---------------------------------------------------                                                            |
-| Welcome Message       | `{"mode": "none", "session":0, "total_sessions":0, "time_left":0, "ongoing": false, "paused": false}`           |
+| Welcome Message       | `{"mode": "", "session":0, "total_sessions":0, "time_left":0, "ongoing": false, "paused": false}`           |
 | Session Running       | `{"mode": "Work", "session": 1, "total_sessions": 4, "time_left": 900, "ongoing": true, "paused": false}`      |
 | Session Running       | `{"mode": "ShortBreak", "session": 2, "total_sessions": 4, "time_left": 50, "ongoing": true, "paused": false}` |
 | Session Paused        | `{"mode": "Work", "session": 2, "total_sessions": 4, "time_left": 456, "ongoing": true, "paused": true}`       |
-| Session End/Reset     | `{"mode": "none", "session": 0, "total_sessions": 0, "time_left": 0, "ongoing": false, "paused": false}`       |
+| Session End/Reset     | `{"mode": "", "session": 0, "total_sessions": 0, "time_left": 0, "ongoing": false, "paused": false}`       |
 
 ## Testing
 

internal/pomodoro/pomodoro.go

@@ -56,7 +56,7 @@ func ResetPomodoro() {
 	mu.Unlock()
 
 	// Reset message
-	shared.Message.Mode = "none"
+	shared.Message.Mode = ""
 	shared.Message.Session = 0
 	shared.Message.TotalSession = 0
 	shared.Message.TimeLeft = 0

internal/shared/state.go

@@ -5,7 +5,7 @@ import (
 )
 
 var Message = models.ServerMessage{
-	Mode:         "none",
+	Mode:         "",
 	Session:      0,
 	TotalSession: 0,
 	TimeLeft:     0,