chore(theme/a11y): a11y for lighthouse score

[markH5]

Summary

before

after

Related Issue

Checklist

• Tests updated (or not required).
• Documentation updated (or not required).

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Lighthouse	1 paths audited Performance: 94 (🟢 up 8 from production) Accessibility: 97 (no change from production) Best Practices: 92 (no change from production) SEO: 100 (no change from production) PWA: - View the detailed breakdown and full score reports

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