fix(login): allow Cornerstone previews

[superdav42]

Summary

• Exclude Cornerstone preview requests from the logged-in custom-login redirect.
• Cover the Cornerstone preview marker with a checkout-pages regression test.

Verification

vendor/bin/phpcs inc/checkout/class-checkout-pages.php tests/WP_Ultimo/Checkout/Checkout_Pages_Test.php
vendor/bin/phpstan analyse inc/checkout/class-checkout-pages.php
vendor/bin/phpunit --filter Checkout_Pages_Test

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aidevops.sh v3.32.200 plugin for OpenCode v1.18.9 with gpt-5.6-terra

Summary by CodeRabbit

• Bug Fixes

  • Cornerstone preview mode now remains accessible on the configured login page without being redirected to the admin panel.

• Tests

  • Added coverage to verify that login-page requests during Cornerstone preview complete without an unwanted redirect.

[coderabbitai]

No actionable comments were generated in the recent review. 🎉

ℹ️ Recent review info

⚙️ Run configuration

Configuration used: defaults

Review profile: CHILL

Plan: Pro Plus

Run ID: ee94ceea-c3d1-416b-a607-daacf8128fff

📥 Commits

Reviewing files that changed from the base of the PR and between a370ef7 and f85b558.

📒 Files selected for processing (2)

• inc/checkout/class-checkout-pages.php
• tests/WP_Ultimo/Checkout/Checkout_Pages_Test.php

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📝 Walkthrough

Walkthrough

The checkout redirect handler now excludes requests with cs_preview_state. A regression test verifies that Cornerstone preview requests on the login page complete without an admin-panel redirect.

Changes

Cornerstone preview redirect handling

Layer / File(s)	Summary
Add preview exclusion and regression coverage inc/checkout/class-checkout-pages.php, tests/WP_Ultimo/Checkout/Checkout_Pages_Test.php	The redirect exclusion list includes cs_preview_state. A regression test verifies that the handler does not redirect Cornerstone preview requests and cleans up request and user state.

Estimated code review effort: 1 (Trivial) | ~5 minutes

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title clearly and concisely describes the main change: allowing Cornerstone previews through the login redirect logic.
Docstring Coverage	✅ Passed	Docstring coverage is 100.00% which is sufficient. The required threshold is 80.00%.
Linked Issues check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check	✅ Passed	Check skipped because no linked issues were found for this pull request.

✨ Finishing Touches

📝 Generate docstrings

• Create stacked PR
• Commit on current branch

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch feature/auto-20260731-132157

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[github-actions]

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