🎨 Palette: Mario game UX and accessibility hints

[EiJackGH]

💡 What

Added a visible instructional hint ("Press Space or ↑ to jump") below the score in the Mario game interface.

🎯 Why

To make the game immediately intuitive for new users, removing the ambiguity of having to guess the controls.

📸 Before/After

(Visual change verified via Playwright, showing the semi-transparent text neatly aligned under the score without disrupting the core gameplay view)

♿ Accessibility

Added aria-live="polite" and aria-atomic="true" to the score element so screen readers can gracefully announce the user's progress without requiring them to tab to the element. Included aria-hidden="true" on the visual keyboard hint as keyboard controls are generally assumed or handled by standard application roles for screen-reader users in this context.

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PR created automatically by Jules for task 7447059144694332343 started by @EiJackGH

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