🎨 Palette: Improve screen reader UX for dynamic game score

[EiJackGH]

💡 What: Extracted the static "Score: " text from the dynamic score value in the Mario game view and added aria-live="polite" to the dynamic score container.

🎯 Why: Dynamic text changes, like game scores increasing, are invisible to screen readers unless explicitly marked as a live region. Furthermore, keeping static text out of the live region ensures the screen reader only announces the new number rather than repeatedly saying "Score: [number]".

📸 Before/After: Visual presentation is identical. Screen reader experience is improved.

♿ Accessibility: Added aria-live="polite" to dynamically changing text value to ensure updates are announced to screen reader users without being intrusive.

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PR created automatically by Jules for task 13331026816469925169 started by @EiJackGH

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