Added support for sandbox_mode in profiles (#5686)

Currently, `approval_policy` is supported in profiles, but
`sandbox_mode` is not. This PR adds support for `sandbox_mode`.

Note: a fix for this was submitted in [this
PR](https://github.com/openai/codex/pull/2397), but the underlying code
has changed significantly since then.

This addresses issue #3034

codex-rs/core/src/config_profile.rs

@@ -4,6 +4,7 @@ use std::path::PathBuf;
 use crate::protocol::AskForApproval;
 use codex_protocol::config_types::ReasoningEffort;
 use codex_protocol::config_types::ReasoningSummary;
+use codex_protocol::config_types::SandboxMode;
 use codex_protocol::config_types::Verbosity;
 
 /// Collection of common configuration options that a user can define as a unit
@@ -15,6 +16,7 @@ pub struct ConfigProfile {
     /// [`ModelProviderInfo`] to use.
     pub model_provider: Option<String>,
     pub approval_policy: Option<AskForApproval>,
+    pub sandbox_mode: Option<SandboxMode>,
     pub model_reasoning_effort: Option<ReasoningEffort>,
     pub model_reasoning_summary: Option<ReasoningSummary>,
     pub model_verbosity: Option<Verbosity>,