Update viewer.js

viewer.js

@@ -108,6 +108,8 @@ export async function initializeViewer(config, instanceId) {
   // Attach input only to canvas
   opts.mouse = new pc.Mouse(canvas);
   opts.touch = new pc.TouchDevice(canvas);
+  opts.keyboard = new pc.Keyboard(window); 
+  
   opts.componentSystems = [
     pc.RenderComponentSystem,
     pc.CameraComponentSystem,
@@ -136,7 +138,11 @@ export async function initializeViewer(config, instanceId) {
   resizeObserver.observe(viewerContainer);
 
   window.addEventListener('resize', () => app.resizeCanvas(viewerContainer.clientWidth, viewerContainer.clientHeight));
-  app.on('destroy', () => resizeObserver.disconnect());
+  app.on('destroy', () => {
+  resizeObserver.disconnect();
+  if (opts.keyboard) opts.keyboard.detach && opts.keyboard.detach();
+});
+
 
   // Assets after app exists
   const assets = {