fix: resolve require.resolve() in ES module Playwright config

- Replace require.resolve() with plain string paths for globalSetup and globalTeardown
- This fixes compatibility with ES modules where require is not available

Tests now run successfully with all browsers (Chromium, Firefox, WebKit,
Mobile Chrome, Mobile Safari, Tablet)

frontend/playwright.config.ts

@@ -107,6 +107,6 @@ export default defineConfig({
   },
 
   // Global setup and teardown
-  globalSetup: require.resolve('./e2e/global-setup.ts'),
-  globalTeardown: require.resolve('./e2e/global-teardown.ts'),
+  globalSetup: './e2e/global-setup.ts',
+  globalTeardown: './e2e/global-teardown.ts',
 });