Fix clientStartup.ts for core package

Updated clientStartup.ts to work without pro features:
- Removed imports from pro/ClientSideRenderer.ts
- Simplified to on-demand component rendering (no automatic hydration)
- Removed pro features: immediate hydration, unmountAll, automatic store hydration
- Core package now builds successfully

Core behavior:
- Components render on-demand via reactOnRailsComponentLoaded()
- Pro package will provide automatic hydration and lifecycle management

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

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

Author: AbanoubGhadban

packages/react-on-rails/src/clientStartup.ts

@@ -1,21 +1,12 @@
-import {
-  hydrateAllStores,
-  hydrateImmediateHydratedStores,
-  renderOrHydrateAllComponents,
-  renderOrHydrateImmediateHydratedComponents,
-  unmountAll,
-} from './pro/ClientSideRenderer.ts';
-import { onPageLoaded, onPageUnloaded } from './pageLifecycle.ts';
+// Core package provides simple synchronous startup
+// Pro package features like immediate hydration and unmounting are not available in core
+import { onPageLoaded } from './pageLifecycle.ts';
 import { debugTurbolinks } from './turbolinksUtils.ts';
 
 export async function reactOnRailsPageLoaded() {
   debugTurbolinks('reactOnRailsPageLoaded');
-  await Promise.all([hydrateAllStores(), renderOrHydrateAllComponents()]);
-}
-
-function reactOnRailsPageUnloaded(): void {
-  debugTurbolinks('reactOnRailsPageUnloaded');
-  unmountAll();
+  // Core package: Components are rendered on-demand via reactOnRailsComponentLoaded
+  // Pro package provides automatic hydration of all components
 }
 
 export function clientStartup() {
@@ -33,13 +24,7 @@ export function clientStartup() {
   // eslint-disable-next-line no-underscore-dangle
   globalThis.__REACT_ON_RAILS_EVENT_HANDLERS_RAN_ONCE__ = true;
 
-  // Force loaded components and stores are rendered and hydrated immediately.
-  // The hydration process can handle the concurrent hydration of components and stores,
-  // so awaiting this isn't necessary.
-  void renderOrHydrateImmediateHydratedComponents();
-  void hydrateImmediateHydratedStores();
-
-  // Other components and stores are rendered and hydrated when the page is fully loaded
+  // Core package: Components are rendered on-demand when Rails calls reactOnRailsComponentLoaded
+  // Pro package provides immediate hydration and automatic rendering on page load
   onPageLoaded(reactOnRailsPageLoaded);
-  onPageUnloaded(reactOnRailsPageUnloaded);
 }