Standardize LSN-based filename

Japin Li <japinli@hotmail.com>

From: Japin Li <japinli@hotmail.com>
To: pgsql-hackers@lists.postgresql.org
Date: 2025-08-13T00:56:12Z
Lists: pgsql-hackers
In commit 2633dae2e, I standardized the LSN formatting for log messages using
zero-padding.  However, I mistakenly changed the snapshot file name[1].

I'd like to standardize the LSN-based filename.  What's your feedback on this?

[1] https://www.postgresql.org/message-id/CAJpy0uDYtHGLkcr1sDqKFUm-ef33Kdky9R8qdDC5JgeM7VdWNA%40mail.gmail.com

-- 
Best regards,
Japin Li
ChengDu WenWu Information Technology Co., LTD.