[BUG] @ mention file picker only shows packages, not individual files (desktop app - Code tab)

Preflight Checklist

• [x] I have searched existing issues and this hasn't been reported yet
• [x] This is a single bug report (please file separate reports for different bugs)
• [x] I am using the latest version of Claude Code

What's Wrong?

In the Claude Code desktop app (Code tab), the @ file mention picker only surfaces packages/directories, not individual files. Typing a filename after @ does not filter to or display matching files.

What Should Happen?

The @ picker should allow searching for and selecting individual files by name, the same way it works in the Claude Code CLI and IDE extensions.

Error Messages/Logs

Steps to Reproduce

1. Open the Claude Code desktop app
2. Navigate to the Code tab
3. In the chat input, type @ followed by a filename (e.g. @VideoPlayerTest)
4. Observe that only packages are shown — no individual files appear in the picker

Claude Model

Sonnet (default)

Is this a regression?

No, this never worked

Last Working Version

_No response_

Claude Code Version

Claude 1.9255.2 (1dc8f7)

Platform

Anthropic API

Operating System

macOS

Terminal/Shell

Terminal.app (macOS)

Additional Information

_No response_