Tui: use collaboration mode instead of model and effort (#9507)

- Only use collaboration modes in the tui state to track model and
effort.
- No behavior change without the collaboration modes flag.
- Change model and effort on /model, /collab (behind a flag), and
shift+tab (behind flag)

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

@@ -95,7 +95,6 @@ async fn status_snapshot_includes_reasoning_details() {
     let mut config = test_config(&temp_home).await;
     config.model = Some("gpt-5.1-codex-max".to_string());
     config.model_provider_id = "openai".to_string();
-    config.model_reasoning_effort = Some(ReasoningEffort::High);
     config.model_reasoning_summary = ReasoningSummary::Detailed;
     config
         .sandbox_policy
@@ -141,6 +140,7 @@ async fn status_snapshot_includes_reasoning_details() {
     let model_slug = ModelsManager::get_model_offline(config.model.as_deref());
     let token_info = token_info_for(&model_slug, &config, &usage);
 
+    let reasoning_effort_override = Some(Some(ReasoningEffort::High));
     let composite = new_status_output(
         &config,
         &auth_manager,
@@ -153,6 +153,7 @@ async fn status_snapshot_includes_reasoning_details() {
         captured_at,
         &model_slug,
         None,
+        reasoning_effort_override,
     );
     let mut rendered_lines = render_lines(&composite.display_lines(80));
     if cfg!(windows) {
@@ -205,6 +206,7 @@ async fn status_snapshot_includes_forked_from() {
         captured_at,
         &model_slug,
         None,
+        None,
     );
     let mut rendered_lines = render_lines(&composite.display_lines(80));
     if cfg!(windows) {
@@ -263,6 +265,7 @@ async fn status_snapshot_includes_monthly_limit() {
         captured_at,
         &model_slug,
         None,
+        None,
     );
     let mut rendered_lines = render_lines(&composite.display_lines(80));
     if cfg!(windows) {
@@ -309,6 +312,7 @@ async fn status_snapshot_shows_unlimited_credits() {
         captured_at,
         &model_slug,
         None,
+        None,
     );
     let rendered = render_lines(&composite.display_lines(120));
     assert!(
@@ -354,6 +358,7 @@ async fn status_snapshot_shows_positive_credits() {
         captured_at,
         &model_slug,
         None,
+        None,
     );
     let rendered = render_lines(&composite.display_lines(120));
     assert!(
@@ -399,6 +404,7 @@ async fn status_snapshot_hides_zero_credits() {
         captured_at,
         &model_slug,
         None,
+        None,
     );
     let rendered = render_lines(&composite.display_lines(120));
     assert!(
@@ -442,6 +448,7 @@ async fn status_snapshot_hides_when_has_no_credits_flag() {
         captured_at,
         &model_slug,
         None,
+        None,
     );
     let rendered = render_lines(&composite.display_lines(120));
     assert!(
@@ -485,6 +492,7 @@ async fn status_card_token_usage_excludes_cached_tokens() {
         now,
         &model_slug,
         None,
+        None,
     );
     let rendered = render_lines(&composite.display_lines(120));
 
@@ -500,7 +508,6 @@ async fn status_snapshot_truncates_in_narrow_terminal() {
     let mut config = test_config(&temp_home).await;
     config.model = Some("gpt-5.1-codex-max".to_string());
     config.model_provider_id = "openai".to_string();
-    config.model_reasoning_effort = Some(ReasoningEffort::High);
     config.model_reasoning_summary = ReasoningSummary::Detailed;
     config.cwd = PathBuf::from("/workspace/tests");
 
@@ -531,6 +538,7 @@ async fn status_snapshot_truncates_in_narrow_terminal() {
 
     let model_slug = ModelsManager::get_model_offline(config.model.as_deref());
     let token_info = token_info_for(&model_slug, &config, &usage);
+    let reasoning_effort_override = Some(Some(ReasoningEffort::High));
     let composite = new_status_output(
         &config,
         &auth_manager,
@@ -543,6 +551,7 @@ async fn status_snapshot_truncates_in_narrow_terminal() {
         captured_at,
         &model_slug,
         None,
+        reasoning_effort_override,
     );
     let mut rendered_lines = render_lines(&composite.display_lines(70));
     if cfg!(windows) {
@@ -590,6 +599,7 @@ async fn status_snapshot_shows_missing_limits_message() {
         now,
         &model_slug,
         None,
+        None,
     );
     let mut rendered_lines = render_lines(&composite.display_lines(80));
     if cfg!(windows) {
@@ -655,6 +665,7 @@ async fn status_snapshot_includes_credits_and_limits() {
         captured_at,
         &model_slug,
         None,
+        None,
     );
     let mut rendered_lines = render_lines(&composite.display_lines(80));
     if cfg!(windows) {
@@ -708,6 +719,7 @@ async fn status_snapshot_shows_empty_limits_message() {
         captured_at,
         &model_slug,
         None,
+        None,
     );
     let mut rendered_lines = render_lines(&composite.display_lines(80));
     if cfg!(windows) {
@@ -770,6 +782,7 @@ async fn status_snapshot_shows_stale_limits_message() {
         now,
         &model_slug,
         None,
+        None,
     );
     let mut rendered_lines = render_lines(&composite.display_lines(80));
     if cfg!(windows) {
@@ -836,6 +849,7 @@ async fn status_snapshot_cached_limits_hide_credits_without_flag() {
         now,
         &model_slug,
         None,
+        None,
     );
     let mut rendered_lines = render_lines(&composite.display_lines(80));
     if cfg!(windows) {
@@ -892,6 +906,7 @@ async fn status_context_window_uses_last_usage() {
         now,
         &model_slug,
         None,
+        None,
     );
     let rendered_lines = render_lines(&composite.display_lines(80));
     let context_line = rendered_lines