🎨 Palette: Make Mario game accessible and add keyboard instructions

[EiJackGH]

💡 What

Added aria-live="polite" and aria-atomic="true" to the score element so screen readers can announce it dynamically. Also added explicit, visible instructional text for keyboard controls underneath the score.

🎯 Why

Screen reader users would not be notified of the score updating dynamically without ARIA attributes. Furthermore, without visual cues, players have to guess the keybindings to play the game, violating a fundamental heuristic for interactive game UI.

📸 Before/After

(Visuals provided via standard Playwright checks)
The UI now correctly features "Press Space or ↑ to jump" immediately visible beneath the standard "Score: X" indicator.

♿ Accessibility

• Ensured dynamic text updates map to screen readers
• Improved user onboarding with intuitive visual feedback

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PR created automatically by Jules for task 14649692834381255217 started by @EiJackGH

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