Consolidate interactive demo output into a final Selection Summary

[joejollands]

Motivation

• The interactive demo was printing selections immediately after each menu which could be cleared by subsequent menu redraws, leaving only the last selection visible; the intent is to present the chosen environment, features, and theme together after the menus complete.

Description

• Update src/Laravel/Commands/TartInteractiveDemoCommand.php to collect the results of menu(), checkboxMenu(), and radioMenu() and print them together under a Selection Summary block (preserving the existing TTY guard and output helpers like good(), notice(), and success()).

Testing

• No automated tests were executed in this rollout because the change only affects interactive demo output (interactive behavior should be validated in a TTY by running php artisan tart:interactive-demo).