[FEATURE] Allow non-blocking commands to execute in parallel with ongoing Claude thinking

Background
there are lots of commands that don't necessarily need the current ongoing task to finish. I need to unnecessarily queue up those commands and wait while Claude is thinking. "feedback" command is a good example. I could have been writing my feedback already when Claude was thinking. Would be nice to have an extension of what can be done with "/btw" command, to other commands that don't inherently need to be blocked by the ongoing thinking. UX-wise, there could be a visual indication for those commands that tells if it's going to queue up or run in parallel to the currently running command.

Environment Info

• Platform: darwin
• Terminal: webstorm
• Version: 2.1.112
• Feedback ID: 37c6dbf7-8463-4648-9870-7dba0e4a5281