Adds sandbox_available param to NewSessionScreen, renders Switch/Select/
Switch widgets for sandbox on/off, filesystem access (rw/ro), and network
toggle. When bwrap is unavailable the switch is disabled and a warning label
is shown. The _policy_from staticmethod maps widget values to SandboxPolicy.
The result tuple gains SandboxPolicy | None as its fifth element. app.py
passes sandbox_available=sandbox.is_available() when opening the dialog and
unpacks the new element to forward sandbox= to create_session.
Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
felixm
f6ed53ce23