[apps] Fix apps enablement condition. (#14011)

- [x] Fix apps enablement condition to check both the feature flag and
that the user is not an API key user.

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

@@ -803,6 +803,13 @@ impl BottomPane {
         true
     }
 
+    pub(crate) fn selected_index_for_active_view(&self, view_id: &'static str) -> Option<usize> {
+        self.view_stack
+            .last()
+            .filter(|view| view.view_id() == Some(view_id))
+            .and_then(|view| view.selected_index())
+    }
+
     /// Update the pending-input preview shown above the composer.
     pub(crate) fn set_pending_input_preview(
         &mut self,