feat: validate client settings and improve logging

- add a function to check if Pomodoro settings are valid
- log a warning for invalid client configurations
- log an info message for valid client configurations
- implement Stringer interface for PomodoroConfig model

🤖

pkg/models/config.go

@@ -1,5 +1,7 @@
 package models
 
+import "fmt"
+
 // Represents the configuration of a pomodoro
 type PomodoroConfig struct {
 	Work       int `json:"work"`       // Length of work sessions in seconds
@@ -8,6 +10,11 @@ type PomodoroConfig struct {
 	Sessions   int `json:"sessions"`   // Number of total sessions
 }
 
+// Stringer interface for the PomodocoConfig model
+func (c PomodoroConfig) String() string {
+	return fmt.Sprintf("{work: %d, short: %d, long: %d, sessions: %d}", c.Work, c.ShortBreak, c.LongBreak, c.Sessions)
+}
+
 // Represents the server configuration
 type ServerConfig struct {
 	ListenAddress string `json:"listenAddress"` // Server listen address