Revert "Auto-remove default gem files" feature

Remove the entire feature that attempted to auto-delete default bin/dev
and config/shakapacker.yml files. This feature was causing more problems
than it solved:

- Difficulty detecting when Shakapacker was truly pre-configured
- Race conditions and timing issues during installation
- Complexity in determining which files were safe to delete

The original goal was to avoid interactive prompts during installation,
but the feature introduced too many edge cases and test failures.

Users can manually handle any conflicts if they arise during installation.

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

Co-Authored-By: Claude <noreply@anthropic.com>

Author: justin808

lib/generators/react_on_rails/install_generator.rb

@@ -38,14 +38,6 @@ class InstallGenerator < Rails::Generators::Base
 
       def run_generators
         if installation_prerequisites_met? || options.ignore_warnings?
-          # Check if Shakapacker is configured BEFORE we run any generators
-          # This way we know if it existed before React on Rails installation
-          shakapacker_was_preconfigured = shakapacker_configured?
-
-          # Only remove default files if Shakapacker was already configured before we started
-          # If it wasn't configured, we'll install it ourselves and shouldn't delete those files
-          remove_default_gem_files if shakapacker_was_preconfigured
-
           invoke_generators
           add_bin_scripts
           # Only add the post install message if not using Redux
@@ -74,62 +66,6 @@ def print_generator_messages
         GeneratorMessages.messages.each { |message| puts message }
       end
 
-      def remove_default_gem_files
-        remove_default_bin_dev
-        remove_default_shakapacker_yml
-      end
-
-      def remove_default_bin_dev
-        bin_dev_path = File.join(destination_root, "bin/dev")
-        return unless File.exist?(bin_dev_path)
-        return unless File.writable?(bin_dev_path)
-
-        current_content = File.read(bin_dev_path).strip
-        return unless bin_dev_matches_rails_default?(current_content)
-
-        puts Rainbow("🗑️  Removing default bin/dev file to avoid conflicts...").yellow
-        FileUtils.rm_f(bin_dev_path)
-      end
-
-      def bin_dev_matches_rails_default?(content)
-        # Rails 7+ simple bin/dev content
-        # Note: Rails doesn't have a bin/dev template in its generators, but this is the
-        # common simple default that many Rails apps use. We check against this known
-        # default to avoid conflicts during installation.
-        rails_simple_default = <<~RUBY.strip
-          #!/usr/bin/env ruby
-          exec "./bin/rails", "server", *ARGV
-        RUBY
-
-        content == rails_simple_default
-      end
-
-      def remove_default_shakapacker_yml
-        config_path = File.join(destination_root, "config/shakapacker.yml")
-        return unless File.exist?(config_path)
-        return unless File.writable?(config_path)
-        return unless shakapacker_yml_matches_default?(config_path)
-
-        puts Rainbow("🗑️  Removing default config/shakapacker.yml file to avoid conflicts...").yellow
-        FileUtils.rm_f(config_path)
-      end
-
-      def shakapacker_yml_matches_default?(config_path)
-        shakapacker_gem_path = Gem.loaded_specs["shakapacker"]&.full_gem_path
-        return false unless shakapacker_gem_path
-
-        default_config_path = File.join(shakapacker_gem_path, "lib/install/config/shakapacker.yml")
-        return false unless File.exist?(default_config_path)
-
-        default_content = File.read(default_config_path)
-        current_content = File.read(config_path)
-
-        current_content == default_content
-      rescue StandardError
-        # If we can't compare, don't delete - better safe than sorry
-        false
-      end
-
       def invoke_generators
         ensure_shakapacker_installed
         if options.typescript?