feat: add Cypress end-to-end tests for login functionality and CI configuration

package.json

@@ -6,7 +6,11 @@
     "dev": "next dev --turbopack",
     "build": "next build",
     "start": "next start",
-    "format": "prettier --write ."
+    "format": "prettier --write .",
+    "cypress:open": "cypress open",
+    "cypress:run": "cypress run",
+    "test:e2e": "cypress run",
+    "ci": "pnpm build && start-server-and-test start http://localhost:3000 test:e2e"
   },
   "dependencies": {
     "@hookform/resolvers": "^5.2.2",
@@ -42,6 +46,7 @@
     "@types/node": "^20",
     "@types/react": "^19",
     "@types/react-dom": "^19",
+    "cypress": "^15.5.0",
     "prettier": "^3.6.2",
     "tailwindcss": "^4",
     "tw-animate-css": "^1.4.0",