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This section details on the original issue you should resolve

<issue_title>Use wp-env for local PHPUnit test runs</issue_title>
<issue_description>## Summary

Running PHPUnit tests locally requires manually installing the WordPress test suite via tests/bin/install-wp-tests.sh with a local MySQL database. Since wp-env is already set up for Playwright E2E tests, we should leverage it for PHPUnit as well.

Current state

• npm run phptests runs vendor/bin/phpunit directly, which requires a local WP test environment and MySQL
• tests/bin/install-wp-tests.sh must be run manually with database credentials
• wp-env is already a dependency and configured with npm run env:start

Proposal

Use wp-env run to execute PHPUnit inside the Docker container where WordPress and MySQL are already available:

npx wp-env run tests-cli vendor/bin/phpunit

Update npm run phptests to use this approach so the workflow becomes:

npm run env:start
npm run phptests

No local MySQL, no install script, no database credentials to manage.

Benefits

• Zero-config local test setup (just needs Docker)
• Same environment as E2E tests
• Consistent with WordPress core and Gutenberg testing patterns
• Removes the need for developers to run install-wp-tests.sh locally</issue_description>

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