## Why
Windows sandbox setup and permission choices need to reflect the connected app server's requirements and the active thread's executors.
## What changed
- Refresh sandbox configuration and requirements for the current working directory when threads or directories change, before setup, and after setup completes.
- Use the thread's observed environments to determine whether sandbox setup is local, remote, mixed, or unknown.
- Defer initial prompt submission while requirements load and preserve the draft if loading fails or required setup is unavailable.
- Hide sandbox setup choices and elevation commands that requirements or executor selection disallow.
## Testing
Add coverage for observed thread hosts, app-server configuration reads, draft preservation and recovery after read failures, deferred initial prompts, and non-admin-only setup choices.
GitOrigin-RevId: d85ac66d18951b752e71d1a6bf25404eeedcad02
73db60e71f