Register ImageExample component in client bundle

The recent refactor to use async: true for non-Redux pages (c0a3b59) caused
the image_example page to fail because ImageExample wasn't registered in the
client bundle. With async: true, components must be registered upfront in the
bundle rather than relying on inline registration.

This commit registers ImageExample in client-bundle.js alongside
HelloTurboStream, fixing the "Could not find component registered with name
ImageExample" error in CI tests.

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude <[email protected]>

Author: justin808

spec/dummy/client/app/packs/client-bundle.js

@@ -7,6 +7,7 @@ import '@hotwired/turbo-rails';
 import ReactOnRails from 'react-on-rails/client';
 
 import HelloTurboStream from '../startup/HelloTurboStream';
+import ImageExample from '../startup/ImageExample';
 import SharedReduxStore from '../stores/SharedReduxStore';
 
 ReactOnRails.setOptions({
@@ -16,6 +17,7 @@ ReactOnRails.setOptions({
 
 ReactOnRails.register({
   HelloTurboStream,
+  ImageExample,
 });
 
 ReactOnRails.registerStore({