enhancement: indicate empty dirs

<img width="965" height="409" alt="Image" src="https://github.com/user-attachments/assets/2f925687-e6e9-4174-950f-349a9bf19549" />

when exploring, one sometimes comes across empty dirs, e.g. `run/lock` above. it would be great if they could be greyed out(?) such that the user knows they are empty and does not need to carry on exploring 