Removed unused automations email design modal

[EvanHahn]

closes https://linear.app/ghost/issue/NY-1330
towards https://linear.app/ghost/issue/NY-1308
ref d8ad698
ref https://linear.app/tryghost/issue/NY-1320

This change should have no user impact.

Automations no longer exposes this copied settings UI, so the duplicate posts components and stale copy comments can be removed.

[coderabbitai]

Walkthrough

This PR consolidates email design infrastructure by establishing admin-x-settings as the single source of truth. It introduces font configuration constants (FONT_OPTIONS, FONT_WEIGHT_OPTIONS, getValidWeight) and an EmailPreview component for rendering email designs with conditional headers, optional images, and configurable footers. The ButtonColorField component is re-established in admin-x-settings. Throughout the codebase, copy-paste documentation comments that explained prior code duplication between admin-x-settings and the posts app are removed, reflecting completion of the consolidation effort.

Suggested labels

ok to merge for me

Suggested reviewers

• troyciesco
• cmraible

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Title check	✅ Passed	The title 'Removed unused automations email design modal' clearly and concisely describes the main change: removal of an unused modal and its associated components from the automations feature.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.
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.
Description check	✅ Passed	The PR description clearly explains the changeset: removing unused email design modal components and stale copy comments from the automations section.

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✨ 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 remove-unused-automations-email-design-modal

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