Missing "Search for public spaces" function

### Your use case

Hi all

On the web- and PC client, it's possible to "Search for public spaces" (by clicking the "+" on the left side column, to add new spaces), but not so on the mobile client.

I didn't find any chance to walk through not joined Spaces on the mobile client, but they are listed as "Rooms", when I list all the available rooms, but when I join, I join a room, which not exists, because in real it's a "Space".

Would be nice to have such a function.

Ivo

### Have you considered any alternatives?

_No response_

### Additional context

_No response_

### Are you willing to provide a PR?

No