test(er-diagram): import CoreGraphics for CGRect geometry in layout tests

Author: datlechin

TableProTests/Models/ERDiagram/ERDiagramLayoutTests.swift

@@ -5,6 +5,7 @@
 //  Tests the component-aware compact layout used by the ER diagram.
 //
 
+import CoreGraphics
 import Foundation
 @testable import TablePro
 import Testing