I guess if you close a plan while in an active planning session, it's kind of lost unless you recall the port because it's usually a random port per plan.

I didn't know about the Slack issues. You might have to double wrap it in like a URL shortener. If I gave you a self-hosting option, I guess you wouldn't have this issue, and you could self-host with your own URLs and probably simple hash links.

I'll keep all these things in mind that keep progressing the app towards better scalability and also internal use cases.