Add three reviewed Zenn article translations

[rdlabo]

Summary

• add the reviewed English translation of the Angular bundle-size article
• add the reviewed English translation of the per-PR npm beta release article
• add the reviewed English translation of the Playwright visual regression baseline article
• localize referenced screenshots and generate article-specific cover images
• update the article catalog, lazy loaders, and sitemap

Articles

• b3874dc571f7da
• npm-beta-per-pull-request
• playwright-visual-regression-ci-baseline

Validation

• npm run articles:validate-translations
• npm run articles:generate
• npm run fmt:check
• npm run lint
• CI=true npm test
• CI=true npm run build
• npm run seo:audit

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