Use test environment manager in chat widget helper

Keep the direct ChatWidget test constructor aligned with the production initializer after wiring the active environment manager through the TUI.

Co-authored-by: Codex <noreply@openai.com>

codex-rs/tui/src/chatwidget/tests/helpers.rs

@@ -195,6 +195,7 @@ pub(super) async fn make_chatwidget_manual(
         raw_output_mode: cfg.tui_raw_output_mode,
         config: cfg,
         effective_service_tier,
+        environment_manager: Arc::new(codex_exec_server::EnvironmentManager::default_for_tests()),
         current_collaboration_mode,
         active_collaboration_mask,
         has_chatgpt_account: false,