Introduce ModelsManager and migrate app-server to use it. (#7552)

codex-rs/tui/src/chatwidget.rs

@@ -1842,7 +1842,6 @@ impl ChatWidget {
             | EventMsg::ItemCompleted(_)
             | EventMsg::AgentMessageContentDelta(_)
             | EventMsg::ReasoningContentDelta(_)
-            | EventMsg::ListModelsResponse(_)
             | EventMsg::ReasoningRawContentDelta(_) => {}
         }
     }