Copying issues inside of Claude Code and Tmux

When running Claude Code inside Byobu, normal text selection may stop working even though copying still works in other Byobu windows.

The fix was to disable mouse handling in Byobu:

Ctrl+A
:
set -g mouse off

Then switch Claude Code back to its default TUI mode:

/tui default

Using both of these together restored normal text selection and Cmd+C.

As a fallback, holding Fn while dragging also works:

Fn + drag
Cmd+C