fix: delete -all fails when only single file is present

executed delete -all,then ran visualize cmd

<img width="687" height="317" alt="Image" src="https://github.com/user-attachments/assets/545ca274-98ff-430f-9b6d-96ebb186c2a7" />


still one previous indexing is there

<img width="997" height="634" alt="Image" src="https://github.com/user-attachments/assets/15f450dc-2420-4e40-962c-e5bf5fe3b870" />