🎨 Palette: Add screen reader support for score updates

[EiJackGH]

💡 What: Added aria-live="polite" and aria-atomic="true" to the dynamic score display in mario-game.njk.
🎯 Why: To make the game more accessible for users with screen readers. Without these attributes, screen readers would not proactively announce when the score increments.
📸 Before/After: Visually, the experience remains identical. The enhancement is fully invisible, existing only in the DOM semantics.
♿ Accessibility: By setting aria-live="polite", the screen reader is instructed to wait until its current task is finished before announcing the new score, avoiding jarring interruptions. aria-atomic="true" ensures the screen reader announces the full "Score: X" string, providing full context rather than just reading an isolated number.

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PR created automatically by Jules for task 627663231500320013 started by @EiJackGH

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