Fixed z index of test email popover in member email editor

[9larsons]

ref https://linear.app/ghost/issue/NY-1110/

[coderabbitai]

Walkthrough

A CSS class modification was made to the EmailPreviewEmailHeader component in the welcome email modal. The className attribute of a div element was updated to include "relative z-20" positioning styles. This change affects the z-index stacking context and relative positioning of the element. No functional logic modifications, error handling changes, or alterations to exported declarations were introduced.

🚥 Pre-merge checks | ✅ 3

✅ Passed checks (3 passed)

Check name	Status	Explanation
Title check	✅ Passed	The title accurately describes the main change: fixing the z-index of a test email popover in the member email editor, which matches the visual/class modification in the changeset.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.
Description check	✅ Passed	The PR description references a Linear issue (NY-1110) and aligns with the stated objective of fixing z-index of a test email popover in the member email editor.

_{✏️ Tip: You can configure your own custom pre-merge checks in the settings.}

✨ Finishing Touches

• 📝 Generate docstrings (stacked PR)
• 📝 Generate docstrings (commit on current branch)

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Post copyable unit tests in a comment
• Commit unit tests in branch fix-email-editor-test

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