Use real buttons for lightbox triggers

[joeseverino]

Summary

• wrap enhanced article images in real button triggers instead of assigning button semantics to img elements
• keep no-JS images plain while preserving pointer and keyboard lightbox behavior
• trim redundant lightbox CSS declarations and update Playwright selectors

Why

Lighthouse flagged the merged lightbox implementation for invalid ARIA because role=button is not allowed on img. This follow-up keeps the feature lightweight while using native controls for the interactive trigger.

Validation

• npx playwright test tests/playwright/lightbox.spec.ts tests/playwright/a11y.single.spec.ts --project=chromium-desktop
• npx playwright test tests/playwright/menu.mobile.spec.ts --project=chromium-mobile
• npm run diagnose -- --fast
• npm run diagnose

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