[BUG] Mouse-wheel/trackpad scroll far too fast in fullscreen TUI on Cursor (macOS), even at CLAUDE_CODE_SCROLL_SPEED=1

Summary

Scrolling in the Claude Code TUI is far too fast in Cursor's integrated terminal on macOS. It remains too fast even with CLAUDE_CODE_SCROLL_SPEED=1 (the documented minimum) and on a version well past the v2.1.153 trackpad fix.

Environment

• Claude Code 2.1.162
• Cursor 3.1.0-pre.11.patch.0 (TERM_PROGRAM=vscode)
• macOS 15.7.5 (24G624)
• Shell: fish (/opt/homebrew/bin/fish)
• "tui": "fullscreen", CLAUDE_CODE_SCROLL_SPEED=1

Steps to reproduce

1. Run Claude Code in Cursor's integrated terminal with "tui": "fullscreen".
2. Set CLAUDE_CODE_SCROLL_SPEED=1.
3. Scroll the transcript with a trackpad/mouse wheel.

Expected

A small, controllable number of lines per scroll notch.

Actual

The view jumps many lines per gesture; CLAUDE_CODE_SCROLL_SPEED=1 provides no further relief since it's already the floor. terminal.integrated.mouseWheelScrollSensitivity has no effect on the captured TUI.

Notes

• This appears to be the same problem as the now-locked #45537, which was auto-closed as a duplicate of #42297 — but #42297 ("No-flicker mode causes mouse scroll input to be interpreted as text") is a different bug, and multiple commenters on #45537 disputed the merge. The bot on #45537 instructs filing a new issue and referencing it.
• Possibly related but distinct: #56546 (fullscreen TUI janky/chunky scrolling).
• Workaround that helps: /tui default (also reported by a commenter on #45537). Requesting a fix (or a sub-1 multiplier / Cursor-specific scroll handling) so fullscreen mode is usable.