🎨 Palette: Enhance Mario Game UX and Accessibility

[EiJackGH]

💡 What:

Added visible keyboard instructions ("Press Space or Up Arrow to jump") and wrapped the score in an aria-live region for screen reader accessibility in the Mario Game widget.

🎯 Why:

To ensure players easily know the controls, and to improve accessibility for visually impaired users by allowing their screen readers to smoothly announce live score updates.

♿ Accessibility:

• Added aria-live="polite" and aria-atomic="true" to the dynamic portion of the score display.
• Separated the static text "Score: " from the dynamic score to prevent screen readers from repeating the word "Score" continuously on every update.

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PR created automatically by Jules for task 6266544540592740330 started by @EiJackGH

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