49b27b0cbc
When shell commands output very long lines (e.g., JSON content from tail -c 10000), the lines would wrap in the terminal. The cursor-up escape code (\x1b[1A) only moves up one visual line, not the entire wrapped content, causing the display to fill with uncleared text. This fix truncates lines to 120 characters in update_tool_output_line() before displaying them, preventing the wrapping issue.