Fix redux_store to get immediate_hydration from Pro config

The redux_store helper method was still trying to get immediate_hydration
from core ReactOnRails configuration. Updated to get it from Pro config
when available, and default to false otherwise.

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

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

Author: AbanoubGhadban

lib/react_on_rails/helper.rb

@@ -253,7 +253,10 @@ def react_component_hash(component_name, options = {})
     #    immediate_hydration: false -- React on Rails Pro (licensed) feature. Pass as true if you wish to
     #                        hydrate this store immediately instead of waiting for the page to load.
     def redux_store(store_name, props: {}, defer: false, immediate_hydration: nil)
-      immediate_hydration = ReactOnRails.configuration.immediate_hydration if immediate_hydration.nil?
+      if immediate_hydration.nil? && ReactOnRails::Utils.react_on_rails_pro?
+        immediate_hydration = ReactOnRailsPro.configuration.immediate_hydration
+      end
+      immediate_hydration = false if immediate_hydration.nil?
 
       redux_store_data = { store_name: store_name,
                            props: props,