🎨 Palette: Add ARIA live region for dynamic score updates

[EiJackGH]

💡 What

Added aria-live="polite" and aria-atomic="true" attributes to the #score div in src/views/mario-game.njk.

🎯 Why

When the player's score updates dynamically during gameplay, screen readers typically ignore the DOM change unless specifically instructed. Adding these attributes ensures the score update is announced gracefully.

📸 Before/After

No visual changes.

♿ Accessibility

• Instructs screen readers to announce the score when it changes without interrupting the user unnecessarily (aria-live="polite").
• Ensures the complete updated text (e.g., "Score: 1") is read out instead of just the number that changed (aria-atomic="true").

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PR created automatically by Jules for task 15432034257381549649 started by @EiJackGH

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