refactor: tui package for CLI styles and prompts, restyle confirmation

internal/cli/machine.go

@@ -10,6 +10,7 @@ import (
 
 	"charm.land/huh/v2"
 	"github.com/cenkalti/backoff/v4"
+	"github.com/psviderski/uncloud/internal/cli/tui"
 	"github.com/psviderski/uncloud/internal/machine/api/pb"
 	"github.com/psviderski/uncloud/internal/sshexec"
 	"google.golang.org/protobuf/types/known/emptypb"
@@ -88,7 +89,7 @@ func provisionMachine(ctx context.Context, exec sshexec.Executor, version string
 }
 
 func promptResetMachine() error {
-	if !IsStdinTerminal() {
+	if !tui.IsStdinTerminal() {
 		return errors.New("the remote machine is already initialised as a cluster member; " +
 			"cannot ask to confirm reset in non-interactive mode, " +
 			"use --yes flag or set UNCLOUD_AUTO_CONFIRM=true to auto-confirm")