Rebuild themes: ship pending it/tr/vi translations

[9larsons]

What

Rebuilds all 16 themes so the pending translation updates actually ship. A fresh `yarn build` on `main` produces an 81-file diff — this PR is that rebuild.

Why

Shared inputs were bumped without rebuilding the themes, so committed built output drifted from source:

• theme-translations 0.0.19 → 0.0.21 added Italian (new locale), Turkish, and Vietnamese strings. Themes currently ship empty strings for these (e.g. Turkish "Access code": "" → "Erişim kodu"). Italian (it.json) is added to every theme for the first time.
• cssnano → v8 (chore(deps): update dependency cssnano to v8 #507) regenerates screen.css with reordered declarations — identical CSS, no functional/visual change, just different minified bytes.

This is the manual "rebuild after a shared change" step that nothing currently enforces (the subject of the CD RFC under review).

Validation

• gscan: all 16 themes pass (Ghost 6.x compatible).
• CSS changes are declaration-reordering only (verified via word-diff).

Effect on merge

Each theme's deploy + subtree workflow fires, shipping the translations to the standalone repos and demo sites.

[coderabbitai]

Caution

Review failed

Pull request was closed or merged during review

Walkthrough

This PR adds Italian locale translations to multiple theme packages, completes Turkish translations for authentication and subscription UI strings across all themes, updates Vietnamese locale wording for navigation and recommendation labels, and regenerates minified CSS stylesheets across ten theme packages (alto, bulletin, dawn, digest, dope, ease, edge, edition, episode, headline, journal). All changes are distributed consistently across the same set of packages, with no modifications to code logic or exported APIs.

Estimated code review effort

🎯 2 (Simple) | ⏱️ ~12 minutes

Possibly related PRs

• TryGhost/Themes#504: Updates Vietnamese locale values for the same UI keys (More links, Next issue, Next post, Recommendations) across the same vi.json files.
• TryGhost/Themes#510: Turkish locale updates mirror missing string translations being filled in tr.json files for the same keys (access codes, validation messages, signup restrictions, "Too many sign-up attempts…").

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Title check	✅ Passed	The title clearly and specifically describes the main purpose of the PR: rebuilding themes to include pending Italian, Turkish, and Vietnamese translations.
Description check	✅ Passed	The description comprehensively explains the context, rationale, validation, and impact. It details the shared dependency updates (theme-translations and cssnano), the changes to locale files across 16 themes, CSS regeneration details, and testing results.
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.

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✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch ship-pending-translations

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