fix: resolve ES modules compatibility in E2E test files

- Replace __dirname with import.meta.url pattern for ES modules compatibility
- Add fileURLToPath imports to all E2E test files
- Fix duplicate require statements in setup-verification.spec.ts
- Update playwright.config.ts to use relative path instead of __dirname

This fixes the 'ReferenceError: __dirname is not defined in ES module scope' error
when running Playwright tests in the ES modules environment.

node_modules/detect-node-es/esm/browser.js

@@ -0,0 +1,2 @@
+export const isNode = false;
+

node_modules/detect-node-es/esm/node.js

@@ -0,0 +1,2 @@
+// Only Node.JS has a process variable that is of [[Class]] process
+export const isNode = Object.prototype.toString.call(typeof process !== 'undefined' ? process : 0) === '[object process]';