[BUG] Problem navigating from bucket to round in hidden group

[francesca-sp]

Describe the bug
Assessment from Hugi after looking into this briefly:
When you are in a bucket of a round in a hidden group, and then click the link to go back to the round, you will end up in the wrong place, i.e. no longer be part of the round. It should send you to "https://cobudget.com/enspiral/thriving-nodes-supercharge-2024" but instead the link leads to "https://cobudget.com/c/thriving-nodes-supercharge-2024", as if the round was not part of the group at all. This has probably been a bug for quite some time and it just never came up because nobody was using hidden rounds in hidden groups recently.

See a screenshare of the issue here from the Enspiral Cobudget round:
https://drive.google.com/file/d/1qKyLk68X82zWxWpmhFVi8hKEJgX0UuyW/view

Original problem description from Enspiral user:
_I was able to reproduce the issue in both Chrome and Safari. Notably, after I accept the invitation, I can click into buckets (not shown in the video).

But when I try to switch rounds, or log out of my account, I get kicked out of the round it seems. So I'm not technically blocked (though I haven't tried allocating money yet). I will just need to reclick the invitation each time I come back._