[BUG] Title: Preview sandbox broken on macOS — EPERM uv_cwd

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?

Error: EPERM: operation not permitted, uv_cwd and getcwd: cannot access parent directories: Operation not permitted

Details: preview_start fails for all executables (node, npm, bash). macOS Seatbelt sandbox blocks getcwd() in spawned processes. No launch.json config works around it. Machine: macOS Darwin 25.3.0, Apple Silicon, Node v25.2.1.

What Should Happen?

Claude Code should be able to control the Chrome browser

Error Messages/Logs

Error: EPERM: operation not permitted, uv_cwd and getcwd: cannot access parent directories: Operation not permitted

Steps to Reproduce

Ask Claude desktop on Mac to do a browser task with Claude in Chrome

Claude Model

Opus

Is this a regression?

I don't know

Last Working Version

_No response_

Claude Code Version

2.1.70.

Platform

Anthropic API

Operating System

macOS

Terminal/Shell

Terminal.app (macOS)

Additional Information

_No response_