@files fails on directories with too many files

### Describe the bug

Hey Team 😊

@files is broken when Copilot CLI is started in a directory with too many files/subfolders. It used to work but I can't really remember what version broke the fuzzy find.

I have to tell you guys that Gemini CLI works fine with the same large folder, so it has to do with the way Copilot CLI is handling large folders.

I am not sure how to provide an example here...

### Affected version

GitHub Copilot CLI 1.0.39.

### Steps to reproduce the behavior

_No response_

### Expected behavior

_No response_

### Additional context

_No response_