Fix rake task loading in Rails engine

- Changed from Dir.glob pattern to explicit file loading in rake_tasks block
- This ensures all React on Rails rake tasks are properly loaded in test environment
- Should resolve "Don't know how to build task 'react_on_rails:generate_packs'" error

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

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

Author: justin808

lib/react_on_rails/engine.rb

@@ -10,8 +10,9 @@ class Engine < ::Rails::Engine
     end
 
     rake_tasks do
-      path = File.join(File.dirname(__FILE__), "..", "tasks", "*.rake")
-      Dir[path].each { |f| load f }
+      load File.expand_path("../tasks/generate_packs.rake", __dir__)
+      load File.expand_path("../tasks/assets.rake", __dir__)
+      load File.expand_path("../tasks/locale.rake", __dir__)
     end
   end
 end