Add option to automatically add a room to a space on the join dialog

### Your use case

#### What would you like to do?

Automatically add a room to a space on join.

#### Why would you like to do it?

- I often join rooms and then immediately add them to a space, and it would be nice to cut down on this repetitive action.

#### How would you like to achieve it?

- Add a button next to the join room button that says something like "Join & add to personal space" or similar.

### Have you considered any alternatives?

_No response_

### Additional context

_No response_