refactor code for better read

internal/adapters/ui/server_form.go

@@ -163,7 +163,7 @@ func (sf *ServerForm) dataToServer(data ServerFormData) domain.Server {
 		}
 	}
 
-	keys := []string{}
+	keys := make([]string, 0)
 	if data.Key != "" {
 		parts := strings.Split(data.Key, ",")
 		for _, p := range parts {

internal/adapters/ui/tui.go

@@ -22,6 +22,10 @@ import (
 	"github.com/rivo/tview"
 )
 
+type App interface {
+	Run() error
+}
+
 type tui struct {
 	logger *zap.SugaredLogger
 
@@ -46,7 +50,7 @@ type tui struct {
 	searchVisible bool
 }
 
-func NewTUI(logger *zap.SugaredLogger, ss ports.ServerService, version, commit string) *tui {
+func NewTUI(logger *zap.SugaredLogger, ss ports.ServerService, version, commit string) App {
 	return &tui{
 		logger:        logger,
 		app:           tview.NewApplication(),