Wire with_remote_overrides to construct model families (#7621)

- This PR wires `with_remote_overrides` and make the
`construct_model_families` an async function
- Moves getting model family a level above to keep the function `sync`
- Updates the tests to local, offline, and `sync` helper for model
families

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

@@ -10,6 +10,7 @@ use codex_core::CodexAuth;
 use codex_core::config::Config;
 use codex_core::config::ConfigOverrides;
 use codex_core::config::ConfigToml;
+use codex_core::openai_models::models_manager::ModelsManager;
 use codex_core::protocol::AgentMessageDeltaEvent;
 use codex_core::protocol::AgentMessageEvent;
 use codex_core::protocol::AgentReasoningDeltaEvent;
@@ -345,6 +346,7 @@ async fn helpers_are_available_and_do_not_panic() {
     let (tx_raw, _rx) = unbounded_channel::<AppEvent>();
     let tx = AppEventSender::new(tx_raw);
     let cfg = test_config();
+    let model_family = ModelsManager::construct_model_family_offline(&cfg.model, &cfg);
     let conversation_manager = Arc::new(ConversationManager::with_auth(CodexAuth::from_api_key(
         "test",
     )));
@@ -361,6 +363,7 @@ async fn helpers_are_available_and_do_not_panic() {
         feedback: codex_feedback::CodexFeedback::new(),
         skills: None,
         is_first_run: true,
+        model_family,
     };
     let mut w = ChatWidget::new(init, conversation_manager);
     // Basic construction sanity.
@@ -394,6 +397,7 @@ fn make_chatwidget_manual() -> (
         bottom_pane: bottom,
         active_cell: None,
         config: cfg.clone(),
+        model_family: ModelsManager::construct_model_family_offline(&cfg.model, &cfg),
         auth_manager: auth_manager.clone(),
         models_manager: Arc::new(ModelsManager::new(auth_manager)),
         session_header: SessionHeader::new(cfg.model),