Add supports_async_loading? semantic method

Replace specific version check with semantic method that clearly indicates
what feature is being checked for. This improves code readability and
makes version requirements more self-documenting.

- Add PackerUtils.supports_async_loading? method
- Replace shakapacker_version_requirement_met?("8.2.0") with supports_async_loading?
- Version requirement is now encapsulated in the semantic method

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

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

Author: justin808

lib/react_on_rails/configuration.rb

@@ -186,7 +186,7 @@ def validate_generated_component_packs_loading_strategy
         1. Use :sync or :defer loading strategy instead of :async
         2. Upgrade to Shakapacker v8.2.0 or above to enable async script loading
       MSG
-      if ReactOnRails::PackerUtils.shakapacker_version_requirement_met?("8.2.0")
+      if ReactOnRails::PackerUtils.supports_async_loading?
         self.generated_component_packs_loading_strategy ||= :async
       elsif generated_component_packs_loading_strategy.nil?
         Rails.logger.warn("**WARNING** #{msg}")

lib/react_on_rails/packer_utils.rb

@@ -33,6 +33,10 @@ def self.supports_autobundling?
       shakapacker_version_requirement_met?(ReactOnRails::PacksGenerator::MINIMUM_SHAKAPACKER_VERSION)
     end
 
+    def self.supports_async_loading?
+      shakapacker_version_requirement_met?("8.2.0")
+    end
+
     # This returns either a URL for the webpack-dev-server, non-server bundle or
     # the hashed server bundle if using the same bundle for the client.
     # Otherwise returns a file path.