Show the default model in model picker (#7838)

See the snapshot

codex-rs/tui/src/bottom_pane/list_selection_view.rs

@@ -40,6 +40,7 @@ pub(crate) struct SelectionItem {
     pub description: Option<String>,
     pub selected_description: Option<String>,
     pub is_current: bool,
+    pub is_default: bool,
     pub actions: Vec<SelectionAction>,
     pub dismiss_on_select: bool,
     pub search_value: Option<String>,
@@ -187,11 +188,14 @@ impl ListSelectionView {
                     let is_selected = self.state.selected_idx == Some(visible_idx);
                     let prefix = if is_selected { '›' } else { ' ' };
                     let name = item.name.as_str();
-                    let name_with_marker = if item.is_current {
-                        format!("{name} (current)")
+                    let marker = if item.is_current {
+                        " (current)"
+                    } else if item.is_default {
+                        " (default)"
                     } else {
-                        item.name.clone()
+                        ""
                     };
+                    let name_with_marker = format!("{name}{marker}");
                     let n = visible_idx + 1;
                     let wrap_prefix = if self.is_searchable {
                         // The number keys don't work when search is enabled (since we let the

codex-rs/tui/src/chatwidget.rs

@@ -2240,9 +2240,10 @@ impl ChatWidget {
                     Some(preset.default_reasoning_effort),
                 );
                 SelectionItem {
-                    name: preset.display_name,
+                    name: preset.display_name.clone(),
                     description,
                     is_current: model == current_model,
+                    is_default: preset.is_default,
                     actions,
                     dismiss_on_select: true,
                     ..Default::default()
@@ -2319,9 +2320,10 @@ impl ChatWidget {
                 });
             })];
             items.push(SelectionItem {
-                name: preset.display_name.to_string(),
+                name: preset.display_name.clone(),
                 description,
                 is_current,
+                is_default: preset.is_default,
                 actions,
                 dismiss_on_select: single_supported_effort,
                 ..Default::default()

codex-rs/tui/src/chatwidget/snapshots/codex_tui__chatwidget__tests__model_selection_popup.snap

@@ -5,11 +5,12 @@ expression: popup
   Select Model and Effort
   Access legacy models by running codex -m <model_name> or in your config.toml
 
-› 1. gpt-5.1-codex-max   Latest Codex-optimized flagship for deep and fast
-                         reasoning.
-  2. gpt-5.1-codex       Optimized for codex.
-  3. gpt-5.1-codex-mini  Optimized for codex. Cheaper, faster, but less
-                         capable.
-  4. gpt-5.1             Broad world knowledge with strong general reasoning.
+› 1. gpt-5.1-codex-max (default)  Latest Codex-optimized flagship for deep and
+                                  fast reasoning.
+  2. gpt-5.1-codex                Optimized for codex.
+  3. gpt-5.1-codex-mini           Optimized for codex. Cheaper, faster, but
+                                  less capable.
+  4. gpt-5.1                      Broad world knowledge with strong general
+                                  reasoning.
 
   Press enter to select reasoning effort, or esc to dismiss.