feat: upgrade to React on Rails v16 enhanced bin/dev and Procfile system

- Update bin/dev to use new ReactOnRails::Dev::ServerManager from PR #1790
- Add support for multiple development modes:
  * bin/dev (HMR development) - default mode
  * bin/dev static - static assets with auto-recompilation
  * bin/dev prod - production-optimized assets
  * bin/dev kill - clean process termination
  * bin/dev help - comprehensive help system
- Rename Procfile.dev-static to Procfile.dev-static-assets for v16 convention
- Add Procfile.dev-prod-assets for production-like asset development
- Preserve project-specific customizations (ReScript, locale tasks)
- Enhanced developer experience with better UI, error handling, and process management

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

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

Author: ihabadham

Procfile.dev-prod-assets

@@ -0,0 +1,9 @@
+# Procfile for development with production assets
+# Uses production-optimized, precompiled assets with development environment
+# Uncomment additional processes as needed for your app
+
+rails: bundle exec rails s -p 3001
+rescript: yarn res:dev
+# sidekiq: bundle exec sidekiq -C config/sidekiq.yml
+# redis: redis-server  # Redis is already running system-wide
+# mailcatcher: mailcatcher --foreground

Procfile.dev-static Procfile.dev-static-assetsProcfile.dev-static renamed to Procfile.dev-static-assets

@@ -1,10 +1,12 @@
+# Procfile for development with static asset compilation
 # You can run these commands in separate shells
-web: rails s -p 3000
-redis: redis-server
+web: bin/rails server -p 3000
+rescript: yarn res:dev
+# redis: redis-server  # Redis is already running system-wide
 
 # Next line runs a watch process with webpack to compile the changed files.
 # When making frequent changes to client side assets, you will prefer building webpack assets
 # upon saving rather than when you refresh your browser page.
 # Note, if using React on Rails localization you will need to run
 # `bundle exec rake react_on_rails:locale` before you run bin/shakapacker
-webpack: sh -c 'bundle exec rake react_on_rails:locale && rm -rf public/packs/* || true && bin/shakapacker -w'
+js: sh -c 'bundle exec rake react_on_rails:locale && rm -rf public/packs/* || true && bin/shakapacker -w'

bin/dev

@@ -1,30 +1,46 @@
 #!/usr/bin/env ruby
 # frozen_string_literal: true
 
-def installed?(process)
-  IO.popen "#{process} -v"
-rescue Errno::ENOENT
-  false
-end
+# ReactOnRails Development Server
+#
+# This script provides a simple interface to the ReactOnRails development
+# server management. The core logic is implemented in ReactOnRails::Dev
+# classes for better maintainability and testing.
+#
+# Each command uses a specific Procfile for process management:
+# - bin/dev (default/hmr): Uses Procfile.dev
+# - bin/dev static: Uses Procfile.dev-static-assets
+# - bin/dev prod: Uses Procfile.dev-prod-assets
+#
+# To customize development environment:
+# 1. Edit the appropriate Procfile to modify which processes run
+# 2. Modify this script for project-specific command-line behavior
+# 3. Extend ReactOnRails::Dev classes in your Rails app for advanced customization
+# 4. Use classes directly: ReactOnRails::Dev::ServerManager.start(:development, "Custom.procfile")
 
-def run(process)
-  system "#{process} start -f Procfile.dev"
-rescue Errno::ENOENT
-  warn <<~MSG
-    ERROR:
-    Please ensure `Procfile.dev` exists in your project!
-  MSG
-  exit!
+begin
+  require "bundler/setup"
+  require "react_on_rails/dev"
+rescue LoadError
+  # Fallback for when gem is not yet installed
+  puts "Loading ReactOnRails development tools..."
+  require_relative "../../lib/react_on_rails/dev"
 end
 
-if installed? "overmind"
-  run "overmind"
-elsif installed? "foreman"
-  run "foreman"
+# Main execution
+case ARGV[0]
+when "production-assets", "prod"
+  ReactOnRails::Dev::ServerManager.start(:production_like, "Procfile.dev-prod-assets")
+when "static"
+  ReactOnRails::Dev::ServerManager.start(:static, "Procfile.dev-static-assets")
+when "kill"
+  ReactOnRails::Dev::ServerManager.kill_processes
+when "help", "--help", "-h"
+  ReactOnRails::Dev::ServerManager.show_help
+when "hmr", nil
+  ReactOnRails::Dev::ServerManager.start(:development, "Procfile.dev")
 else
-  warn <<~MSG
-    NOTICE:
-    For this script to run, you need either 'overmind' or 'foreman' installed on your machine. Please try this script after installing one of them.
-  MSG
-  exit!
-end
+  puts "Unknown argument: #{ARGV[0]}"
+  puts "Run 'bin/dev help' for usage information"
+  exit 1
+end