fix: more robust <app> autocomplete + error handling

See toolshed/organising#652

cli/app/logs.go

@@ -2,6 +2,7 @@ package app
 
 import (
 	"context"
+	"fmt"
 	"io"
 	"os"
 	"slices"
@@ -37,8 +38,8 @@ var AppLogsCommand = &cobra.Command{
 		case 1:
 			app, err := appPkg.Get(args[0])
 			if err != nil {
-				log.Debugf("autocomplete failed: %s", err)
-				return nil, cobra.ShellCompDirectiveDefault
+				errMsg := fmt.Sprintf("autocomplete failed: %s", err)
+				return []string{errMsg}, cobra.ShellCompDirectiveError
 			}
 			return autocomplete.ServiceNameComplete(app.Name)
 		default: