/context and /cost TUI renders off-screen and disappears (v2.1.11, macOS)

Description

The /context and /cost commands render their TUI visualization off-screen. The content is only visible when scrolling up, and after ~10 seconds the normal input prompt reappears, making the visualization essentially unusable.

Environment

• Claude Code version: 2.1.11
• OS: macOS Darwin 25.2.0
• Terminals tested: Terminal.app, iTerm2 3.6.6
• TERM: xterm-256color
• Theme: Dark mode
• claude doctor: OK

Steps to reproduce

1. Run claude
2. Type /context or /cost

Expected behavior

Context/cost visualization appears on screen and is readable

Actual behavior

• Screen appears to go black
• Content is pushed off-screen (only visible when scrolling up immediately)
• After ~10 seconds, normal prompt returns
• Content disappears from scroll history

Additional notes

• /model command works correctly
• Issue persists across both Terminal.app and iTerm2
• Enabling "Save lines to scrollback in alternate screen mode" in iTerm2 may help preserve the content, but the visualization still renders incorrectly