🎨 Palette: Make Mario game score updates accessible

[EiJackGH]

💡 What: Added aria-live="polite" and aria-atomic="true" to the #score container in src/views/mario-game.njk.
🎯 Why: Without these attributes, screen readers do not announce dynamic updates to the score when the user gains points, leaving visually impaired users unaware of their progress.
📸 Before/After: Visual UI is unchanged (verified via Playwright screenshot).
♿ Accessibility: Transforms the static score container into an accessible live region that politely announces content changes to assistive technologies.

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PR created automatically by Jules for task 10555140499537585046 started by @EiJackGH

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