Common: move the step refresh into the bridge

packages/app-android/app/views/main.ts

@@ -128,9 +128,6 @@ export class MainController implements MainView {
       showNotification: (key) => {
         notificationService.showNotification({ title: _(NOTIFICATION_TITLES[key] || key), timeout: 2 });
       },
-      updateDebugInfo: (simulator) => {
-        debuggerView.updateDebugInfo(simulator);
-      },
     });
 
     this.mainBridge = new MainEventBridge({

packages/app-gnome/src/views/main.window.ts

@@ -712,12 +712,6 @@ export class MainWindow extends Adw.ApplicationWindow implements MainView {
           timeout: 2,
         });
       },
-      updateDebugInfo: (simulator) => {
-        // If stepper is enabled, update full debugger; otherwise just debug info
-        if (this._gameConsole.simulator.stepperEnabled) {
-          this.updateDebugger();
-        }
-      },
     });
     this.gameConsoleBridge.connect();
   }

packages/app-web/src/app/main-window.ts

@@ -400,9 +400,6 @@ export class MainWindow implements MainView {
       },
       updateUiState: () => this.updateRunActions(this.simulator.state),
       showNotification: (key) => this.showToast(NOTIFICATION_TITLES[key] ?? key),
-      updateDebugInfo: () => {
-        if (this.simulator.stepperEnabled) this.updateDebugger();
-      },
     });
     this.bridge.connect();
 

packages/common-ui/src/controller/game-console-event-bridge.ts

@@ -1,5 +1,5 @@
 import { SimulatorState, _ } from "@learn6502/core";
-import type { Assembler, Simulator } from "@learn6502/core";
+import type { Assembler } from "@learn6502/core";
 import { gameConsoleController } from "./game-console-controller.ts";
 import { debuggerController } from "./debugger-controller.ts";
 
@@ -27,9 +27,6 @@ export interface GameConsoleEventBridgeCallbacks {
 
   /** Show a notification with a translatable key. */
   showNotification(key: string): void;
-
-  /** Called when a step/multistep/goto occurs and debugger may need update. */
-  updateDebugInfo(simulator: Simulator): void;
 }
 
 type EventUnsubscriber = () => void;
@@ -125,8 +122,15 @@ export class GameConsoleEventBridge {
       if (signal.message) {
         this.callbacks.formatAndLog(signal.message, signal.params);
       }
-      if (signal.simulator) {
-        this.callbacks.updateDebugInfo(signal.simulator);
+      // "step" is not the Step button: Simulator.execute() emits it for every
+      // executed instruction, and a free run runs execute() 97 times per
+      // multiExecute() tick. Refreshing the debugger here is therefore only
+      // affordable while the stepper is on — multiExecute() then returns
+      // early, so one event is one press of Step, and the memory monitor has
+      // to be redrawn or the step leaves stale bytes on screen. A free run is
+      // covered by the "multistep" handler below, whose update is throttled.
+      if (signal.simulator.stepperEnabled) {
+        this.callbacks.updateDebugger();
       }
     });