Joining a space from the room flow. (#4563)

* Add the More menu to SpaceScreen.

And a simple way to leave a space for testing.

* Start a space flow when accepting a space invite from the room flow.

* Minimise the tab bar on iOS 26 when scrolling down.

* Enable spaces by default!

ElementX/Sources/Screens/Spaces/SpaceScreen/SpaceScreenModels.swift

@@ -11,11 +11,14 @@ enum SpaceScreenViewModelAction {
     case selectSpace(SpaceRoomListProxyProtocol)
     case selectUnjoinedSpace(SpaceRoomProxyProtocol)
     case selectRoom(roomID: String)
+    case leftSpace
 }
 
 struct SpaceScreenViewState: BindableState {
     let space: SpaceRoomProxyProtocol
     
+    var permalink: URL?
+    
     var isPaginating = false
     var rooms: [SpaceRoomProxyProtocol]
     var selectedSpaceRoomID: String?
@@ -30,4 +33,5 @@ struct SpaceScreenViewStateBindings { }
 
 enum SpaceScreenViewAction {
     case spaceAction(SpaceRoomCell.Action)
+    case leaveSpace
 }