Minor space tweaks (#4577)

* Hide the space ShareLink on iOS 26 for now.

* Don't allow the last admin to leave a space.

AccessibilityTests/Sources/GeneratedAccessibilityTests.swift

@@ -251,6 +251,10 @@ extension AccessibilityTests {
         try await performAccessibilityAudit(named: "LabsScreen_Previews")
     }
 
+    func testLeaveSpaceRoomDetailsCell() async throws {
+        try await performAccessibilityAudit(named: "LeaveSpaceRoomDetailsCell_Previews")
+    }
+
     func testLeaveSpaceView() async throws {
         try await performAccessibilityAudit(named: "LeaveSpaceView_Previews")
     }