Spaces belong to a team, shown on the space

Every shared space now belongs to a team, and the space shows which team it's under so the context is always clear. When you create a space and you're on more than one team, you pick which team it belongs to; otherwise it uses your own. Your private personal space stays private — never attached to a team or visible to team admins.

Team owners and admins can see their team's spaces, and the owner of an older unassigned space can place it on a team.