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/View/SpaceScreen.swift

@@ -42,6 +42,7 @@ struct SpaceScreen: View {
         }
     }
     
+    @ToolbarContentBuilder
     var toolbar: some ToolbarContent {
         // Use the same trick as the RoomScreen for a leading title view that
         // also hides the navigation title.
@@ -50,6 +51,22 @@ struct SpaceScreen: View {
                            roomAvatar: context.viewState.space.avatar,
                            mediaProvider: context.mediaProvider)
         }
+        
+        ToolbarItemGroup(placement: .secondaryAction) {
+            if let permalink = context.viewState.permalink {
+                Section {
+                    ShareLink(item: permalink) {
+                        Label(L10n.actionShare, icon: \.shareIos)
+                    }
+                }
+            }
+            
+            Section {
+                Button(role: .destructive) { context.send(viewAction: .leaveSpace) } label: {
+                    Label(L10n.actionLeaveSpace, icon: \.leave)
+                }
+            }
+        }
     }
 }