chore: sandbox refactor 2 (#4653)

Revert the revert and fix the UI issue

codex-rs/core/src/state/service.rs

@@ -1,9 +1,9 @@
 use crate::RolloutRecorder;
 use crate::exec_command::ExecSessionManager;
+use crate::executor::Executor;
 use crate::mcp_connection_manager::McpConnectionManager;
 use crate::unified_exec::UnifiedExecSessionManager;
 use crate::user_notification::UserNotifier;
-use std::path::PathBuf;
 use tokio::sync::Mutex;
 
 pub(crate) struct SessionServices {
@@ -12,7 +12,7 @@ pub(crate) struct SessionServices {
     pub(crate) unified_exec_manager: UnifiedExecSessionManager,
     pub(crate) notifier: UserNotifier,
     pub(crate) rollout: Mutex<Option<RolloutRecorder>>,
-    pub(crate) codex_linux_sandbox_exe: Option<PathBuf>,
     pub(crate) user_shell: crate::shell::Shell,
     pub(crate) show_raw_agent_reasoning: bool,
+    pub(crate) executor: Executor,
 }