Most hated keyboard shortcut: CTRL + Z - Copilot CLI says: Goodbye! (green)

### Describe the bug

Every writer, every developer is typing, copying, pasting and undoing and redoing.

First of all copy and paste does NOT work in Copilot. Please refer to other issues.

What happens?
When i select a peace of text outside the CLI, or from another Copilot CLI and right mouse to paste in Copilot CLI (or CTRL +C and CTRL + V), is does NOT work. I paste something old from clipboard, not what i just copied.

Then i use CTRL + Z to undo. This is automatic behavior, 1 millions of people do every day.
I don't want the wrong pasted text. And what happens? Copilot says: Goodbye and exits. I hate this so much!

The only reason i use Copilot CLI is for the auto mode of models and control my models, budgets and policies in github. If Claude CLI or Gemini CLI ever support other models in their future releases then their own, i would switch forever and never use Copilot CLI again. I really hate it.

Please remove the CTRL+Z shortcut or fix it. I lost so many conversations.

ps. On linux it says: please use fq to return to the session. That also doesnt work.

Please fix this very very very anyoing bug!

### Affected version

_No response_

### Steps to reproduce the behavior

_No response_

### Expected behavior

_No response_

### Additional context

_No response_

Beginne damit, das Verhalten beim Beenden mit Ctrl+Z sowie das gemeldete Verhalten beim Kopieren/Einfügen und bei der Rückkehr zur Sitzung mit `fq` in Copilot CLI zu reproduzieren, insbesondere unter Linux. Untersuche die Tastenkürzel- und Sitzungseingabeverarbeitung der CLI; als erledigt gilt die Aufgabe, wenn Ctrl+Z nicht mehr unerwartet beendet und das dokumentierte Verhalten zum Zurückkehren zur Sitzung funktioniert.

Vom Indexierungsmodell aus dem Issue-Text verfasst.