ChatUtils

Added Copy icon to Stacked Messages & config.

Renamed GUI labels:

Compacting → Compact Chat

Consecutive Only → Consecutive Mode.

Added a new GUI config toggle:

Reset On World Change (id = 3).

When Compact Chat is OFF, all dependent options are now disabled (Expire Time, Consecutive Mode, Reset On World Change).

Added config backing field resetOnWorldChange and updated world-load behavior so stack reset only happens when this option is ON main