Paste from GNOME Text Editor still fails on GNOME Wayland in 1.0.57

### Describe the bug

On GNOME Wayland, pasting text copied from **GNOME Text Editor** directly into the Copilot CLI prompt still fails on **1.0.57**.

A notable workaround is that if I first paste the same content into a normal terminal, then copy it again from the terminal, it can be pasted into Copilot CLI successfully.

This strongly suggests Copilot CLI is still mishandling clipboard content/type probing from editor-originated clipboard data on GNOME Wayland, while terminal re-copy reduces it to a simpler plain-text clipboard payload that works.

### Affected version

GitHub Copilot CLI 1.0.57

### Steps to reproduce the behavior

1. Use Ubuntu GNOME on Wayland.
2. Open **GNOME Text Editor**.
3. Copy some plain text from the editor.
4. Open `copilot` inside **GNOME Terminal**.
5. Try pasting into the Copilot CLI prompt.
6. Observe that paste does not work correctly.
7. As a workaround, paste the same text into a normal terminal first, copy it again from that terminal, then paste into Copilot CLI.
8. Observe that the terminal-recopied text pastes successfully into Copilot CLI.

### Expected behavior

Text copied from a normal desktop text editor should paste into the Copilot CLI prompt on GNOME Wayland without needing a terminal re-copy workaround.

### Additional context

Environment:

- OS: Ubuntu (Wayland session)
- Desktop: GNOME / Mutter
- Terminal: GNOME Terminal
- Editor: GNOME Text Editor
- Copilot CLI: 1.0.57

Relevant log evidence from `~/.copilot/logs/process-*.log`:

```text
Failed to get clipboard attachment file path: Error: Failed to get files: Failed to query MIME types: A required Wayland protocol (ext-data-control, or wlr-data-control version 1) is not supported by the compositor
Failed to write clipboard image to disk: Error: Failed to get image: Failed to query MIME types: A required Wayland protocol (ext-data-control, or wlr-data-control version 1) is not supported by the compositor
```

This appears related to the earlier GNOME Wayland paste issue in #3414, but the problem is still reproducible in 1.0.57 with a concrete editor-to-Copilot repro path.

The key symptom difference worth calling out is:

- **Direct editor -> Copilot CLI paste fails**
- **Editor -> terminal -> recopy -> Copilot CLI paste works**

That suggests the remaining bug is not just generic paste failure, but handling of clipboard metadata/MIME types from editor-provided clipboard content under GNOME Wayland.

Reproduce the direct editor-to-Copilot paste and terminal-recopy workaround in GNOME Wayland, then inspect ~/.copilot/logs/process-*.log for the clipboard errors. Read the earlier GNOME Wayland issue #3414 and trace the Copilot CLI prompt's clipboard handling. Done when text copied from GNOME Text Editor pastes directly into the prompt without the terminal workaround.

Written by the indexing model from the issue text.