Less version 679

Version 679 was released for beta testing on 29 May 2025, and was released for general use on 19 Jun 2025.

These are the differences between version 678 and version 679:

• Fix bad parsing of lesskey file an env var is a prefix of another env var (github #626).
• Fix unexpected exit using -K if a key press is received while reading the input file (github #628).