Scrollbar not visible and copy/paste broken in interactive CLI (TERM=xterm, SSH)

What happened

In the interactive Claude Code CLI, the scrollbar is not visible, and click-drag copy/paste has stopped working in the terminal.

Environment

• Claude Code: 2.1.193
• OS: Linux 6.1.159 (Amazon Linux 2023, x86_64 EC2 instance)
• TERM=xterm, TERM_PROGRAM=(unset)
• Connecting over SSH

Steps to reproduce

1. Launch Claude Code in an xterm-type terminal over SSH.
2. Try to scroll using the terminal scrollbar — no scrollbar appears.
3. Try to select text with click-drag and copy — selection/copy does not work as it did previously.

Expected

Scrollbar visible; native terminal copy/paste works.

Actual

No scrollbar; copy/paste non-functional via normal click-drag.

Notes

Possibly related to the TUI enabling mouse tracking (SGR mouse mode), which captures drag events and suppresses native selection. Shift-drag is a partial workaround but is not discoverable.