Fix cypress index test broken by the sidebar truncate wrapper (#484)

packages/cli/cypress/e2e/index.cy.js had the same brittle
cy.contains("preview")/("Emails") assertions that #508 fixed in the e2e
copy, but this repo-level copy was missed — so #484's truncate <div> made
cy.contains match the wrapper (no role/aria-expanded) and the "cypress"
workflow failed. Scope to cy.contains('[role="treeitem"]', ...) like #508.
Also drop a stray unused `require("typescript")` at the top of the file.

Author: psugihara

packages/cli/cypress/e2e/index.cy.js

@@ -1,5 +1,3 @@
-const { isBindingElement } = require("typescript");
-
 describe("index page tests", () => {
   beforeEach(() => {
     cy.visit("/");
@@ -8,10 +6,12 @@ describe("index page tests", () => {
   it("should redirect index to previewFunction with tree", () => {
     cy.location("pathname").should("eq", "/previews/Welcome/preview");
 
-    cy.contains("preview")
+    // Scope to the treeitem rather than the label text so the assertions stay
+    // valid when the label is wrapped (e.g. in a truncating element).
+    cy.contains('[role="treeitem"]', "preview")
       .should("have.attr", "aria-selected", "true")
       .should("have.attr", "role", "treeitem");
-    cy.contains("Emails")
+    cy.contains('[role="treeitem"]', "Emails")
       .should("have.attr", "aria-expanded", "true")
       .should("have.attr", "aria-selected", "false")
       .should("have.attr", "role", "treeitem");