Simplify assertion - Cypress handles return automatically

Co-authored-by: leecalcote <7570704+leecalcote@users.noreply.github.com>

Author: Copilot

cypress-action/cypress/e2e/e2e/loadDesign.js

@@ -51,7 +51,7 @@ const captureSnapshot = ({ window, designId, theme }) => {
 
     // Wait for cytoscape instance to be available
     cy.window().should((win) => {
-        return expect(win.cyto).to.exist;
+        expect(win.cyto).to.exist;
     });
 
     cy.window().then((win) => {