🎨 Palette: Mario Game UX Accessibility & Hints

[EiJackGH]

💡 What: Added aria-live="polite" and aria-atomic="true" to the dynamic score counter and introduced a semi-transparent, floating keyboard controls hint ("Press Space or Up Arrow to jump") underneath the score in the Mario game. Also fixed a CI failure by stripping the invalid standard library venv module from requirements.txt.

🎯 Why: The score was dynamically updating but completely inaccessible to screen readers. Furthermore, players landing on the page had no way to know the game controls other than guessing or reading the source code. This small hint reduces cognitive friction, and the aria updates make the widget inclusive.

📸 Before/After: The game now displays a "Press Space or Up Arrow to jump" hint below the score on page load. Playwright screenshots show it perfectly overlays the game background without obstructing the gameplay area.

♿ Accessibility: Added ARIA live regions to the score counter. The controls hint was marked with aria-hidden="true" as visual help, ensuring it doesn't clutter screen reader announcements where basic interaction might already be implied or read from surrounding context.

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PR created automatically by Jules for task 790433205743827776 started by @EiJackGH

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