Markdown tables disappear when terminal is expanded to full screen

Description

Markdown tables render correctly at normal terminal width but disappear entirely when the terminal is expanded to full screen.

Steps to Reproduce

1. Have Claude output a markdown table in the terminal
2. View at normal terminal width - table renders correctly
3. Expand terminal to full screen - table disappears

Expected Behavior

Table should continue to render (with more room to spare) when terminal width increases.

Actual Behavior

Table disappears entirely at wider terminal widths.

Environment

• macOS (Darwin 24.6.0)
• Claude Code CLI

Notes

This is counterintuitive since more horizontal space should make table rendering easier, not break it. Likely a calculation overflow or threshold issue in the markdown rendering logic.