[BUG] Desktop app: Finder file/folder picker never opens for "change directory" or "upload document"

### Preflight Checklist

- [x] I have searched [existing issues](https://github.com/anthropics/claude-code/issues?q=is%3Aissue%20state%3Aopen%20label%3Abug) 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?

**Description**
When trying to change the working directory or upload a document in the Claude desktop app, the native macOS Finder picker dialog never opens. No error is shown — the action silently does nothing.

This also happens when changing the working directory for a scheduled routine: the cursor switches to a loading state, but no folder-picker pop-up ever appears.

**Workaround**
Manually dragging and dropping the file into the app works fine, so file handling itself isn't broken — only the native file/folder picker dialog fails to launch.

**Environment**
- OS: macOS (Darwin 25.6.0)
- App: Claude desktop app, Code tab

### What Should Happen?

The Finder picker dialog opens as normal.

### Error Messages/Logs

```shell

```

### Steps to Reproduce

**Steps to reproduce**
1. Open the Claude desktop app
2. Try to change the working directory (either in a regular session or when setting up/editing a routine), or try to upload a document via the picker
3. Observe: cursor may briefly show a loading state, but no Finder dialog ever appears

### Claude Model

Not sure / Multiple models

### Is this a regression?

Yes, this worked in a previous version

### Last Working Version

_No response_

### Claude Code Version

2.1.273

### Platform

Other

### Operating System

macOS

### Terminal/Shell

Terminal.app (macOS)

### Additional Information

_No response_

No files, tests, or entry points are named. Reproduce the working-directory and document-upload actions on macOS, then trace the native picker invocation from those actions. Done means the Finder picker opens for both regular and scheduled working-directory changes and for document uploads.

Written by the indexing model from the issue text.