[BUG] Sending files, current buffer, or lines to claude doesn't work.

## Bug Description

Sending files, current buffer, or lines to claude doesn't work.

## To Reproduce

Steps to reproduce the behavior:

1. Send files to claude code
2. See error

[ClaudeCode] [queue] [ERROR] Connection timeout - clearing 1 queued @ mentions

## Expected Behavior

I expect that files and code lines can be sent to claude. This worked for me a few days ago. I guess claude auto-updated and now it isn't working.

## Environment

- Neovim version: v0.10.4
- Claude Code CLI version: 1.0.41
- OS: macOS 15.5
- Plugin version: latest

## Error Messages
[ClaudeCode] [queue] [ERROR] Connection timeout - clearing 1 queued @ mentions

If applicable, add error messages or logs.

```
Paste any error messages here
```

## Additional Context

Add any other context about the problem here.