🎨 Palette: [UX improvement] Add keyboard hint and ARIA live to Mario game score

[EiJackGH]

💡 What

Added a visible keyboard control hint ("Press Space or ↑ to jump") to the Mario game UI and enhanced the score display with aria-live attributes.

🎯 Why

New users often don't know the controls for web-based minigames, leading to immediate failure and frustration. The added hint makes the game instantly intuitive. Additionally, the dynamic score was previously invisible to screen readers.

📸 Before/After

(See Playwright verification screenshots in the PR discussion)

• Before: Blank UI, users have to guess the jump key.
• After: Clear, semi-transparent overlay in the top right corner indicating controls.

♿ Accessibility

Added aria-live="polite" and aria-atomic="true" to the #score element so that screen readers will announce score updates as the player progresses, providing a better experience for non-visual users.

---

PR created automatically by Jules for task 9418435583707819712 started by @EiJackGH

[google-labs-jules]

👋 Jules, reporting for duty! I'm here to lend a hand with this pull request.

When you start a review, I'll add a 👀 emoji to each comment to let you know I've read it. I'll focus on feedback directed at me and will do my best to stay out of conversations between you and other bots or reviewers to keep the noise down.

I'll push a commit with your requested changes shortly after. Please note there might be a delay between these steps, but rest assured I'm on the job!

For more direct control, you can switch me to Reactive Mode. When this mode is on, I will only act on comments where you specifically mention me with @jules. You can find this option in the Pull Request section of your global Jules UI settings. You can always switch back!

New to Jules? Learn more at jules.google/docs.

---

For security, I will only act on instructions from the user who triggered this task.

[github-actions]

Stale pull request message