Better implementation of interrupt on Esc (#2111)

Use existing abstractions

codex-rs/tui/src/app.rs

@@ -235,20 +235,6 @@ impl App<'_> {
                                 self.app_event_tx.send(AppEvent::ExitRequest);
                             }
                         },
-                        KeyEvent {
-                            code: KeyCode::Esc,
-                            kind: KeyEventKind::Press,
-                            ..
-                        } => match &mut self.app_state {
-                            AppState::Chat { widget } => {
-                                if !widget.on_esc() {
-                                    self.dispatch_key_event(key_event);
-                                }
-                            }
-                            AppState::Onboarding { .. } => {
-                                self.dispatch_key_event(key_event);
-                            }
-                        },
                         KeyEvent {
                             code: KeyCode::Char('z'),
                             modifiers: crossterm::event::KeyModifiers::CONTROL,