feat: refactor shared.Message to a channel

- remove `shared` package and shared.Message
- rename `notifications` package to `frontend`
- introduce a channel send the received ServerMessages to the frontend handler(s)
- move keyhandler to goroutine
- simplify password handling in Start function
- update import names when importing from GoTomoto

internal/helper/config.go

@@ -1,7 +1,7 @@
 package helper
 
 import (
-	"git.smsvc.net/pomodoro/ChronoTomato/pkg/models"
+	ChronoTomato "git.smsvc.net/pomodoro/ChronoTomato/pkg/models"
 	"github.com/charmbracelet/log"
 	"gopkg.in/yaml.v3"
 	"os"
@@ -9,8 +9,8 @@ import (
 	"strings"
 )
 
-func ParseConfig(filename string) models.ConfigFile {
-	var config models.ConfigFile
+func ParseConfig(filename string) ChronoTomato.Config {
+	var config ChronoTomato.Config
 	if strings.HasPrefix(filename, "~/") {
 		dirname, _ := os.UserHomeDir()
 		filename = filepath.Join(dirname, filename[2:])
@@ -19,7 +19,7 @@ func ParseConfig(filename string) models.ConfigFile {
 	if err != nil {
 		log.Warn("Error opening config file!", "reason", err)
 		log.Warn("Using defaults")
-		return models.ConfigFile{
+		return ChronoTomato.Config{
 			URL: "ws://localhost:8080/ws",
 		}
 	}