chore: add auth spec to plyrt

[pauldambra]

auth spec?

[greptile-apps]

PR Summary

Added comprehensive Playwright E2E test suite for authentication flows, replacing existing tests with a more robust implementation.

• Added 8 test cases in /playwright/e2e/auth.spec.ts covering critical auth scenarios like login/logout, failed attempts, and multi-tab sessions
• Implemented test for Google OAuth integration verification in auth flow
• Added URL redirect handling tests for both simple and complex URLs post-login
• Moved credentials to environment variables in /playwright/utils/playwright-test-base.ts with sensible defaults
• Added auth state persistence between tests for improved performance using cookie/storage caching

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