Garbage text when highlighting text for copy

### Describe the bug

Whenever I try to highlight output text for copy, I get a ton of garbage text in my input line. When I do "ctrl + C" to copy, additional garbage text is added to my input line.

### Affected version

1.0.69

### Steps to reproduce the behavior

1. Use cursor to highlight text (garbage text will appear)
2. Ctrl+C (more garbage text will appear)

### Expected behavior

There should be no garbage text when highlighting the output text for copying.

### Additional context

- Terminal: Mate 1.26.1
- OS: Rocky Linux 8.10 (Green Obsidian)
- Running on VM using Exceed to access the VM

Reproduce the issue in Copilot CLI 1.0.69 by highlighting output and pressing Ctrl+C, using the reported MATE terminal, Rocky Linux 8.10, and Exceed VM setup if available. Trace the terminal output-selection and copy handling, then verify that highlighting and copying no longer add text to the input line.

Written by the indexing model from the issue text.