fix: auto-clean stale overmind sockets on startup

Added automatic cleanup of stale overmind socket files when starting
bin/dev. This prevents "overmind is already running" errors by safely
removing socket files only when no overmind processes are actually running.

The cleanup runs automatically before starting any dev mode, making the
development experience more seamless.

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

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

Author: justin808

lib/generators/react_on_rails/bin/dev

@@ -29,7 +29,27 @@ def ensure_procfile(procfile)
   exit 1
 end
 
+def cleanup_stale_sockets
+  # Check for stale overmind socket files
+  socket_files = [".overmind.sock", "tmp/sockets/overmind.sock"]
+
+  # Only clean up if overmind is not actually running
+  overmind_pids = `pgrep -f "overmind" 2>/dev/null`.split("\n").map(&:to_i)
+
+  if overmind_pids.empty?
+    socket_files.each do |socket_file|
+      if File.exist?(socket_file)
+        puts "   🧹 Cleaning up stale socket: #{socket_file}"
+        File.delete(socket_file) rescue nil
+      end
+    end
+  end
+end
+
 def run_with_process_manager(procfile)
+  # Clean up stale sockets before starting
+  cleanup_stale_sockets
+
   if installed?("overmind")
     system "overmind start -f #{procfile}"
   elsif installed?("foreman")