🎨 Palette: Improve Personal Rating UX and Accessibility

[Gamepulse]

This PR implements a micro-UX improvement for the Personal Rating feature.

💡 What:

• Added a "Clear Rating" button (✕) next to the personal rating label in the game detail header.
• Converted the rating display into a semantic <label> associated with the range input.
• Marked the "0" and "100" markers as aria-hidden.
• Cleaned up an unused state variable in GameScreenshotsCarousel.tsx that was causing build failures.

🎯 Why:

• Native HTML range inputs cannot represent a null state once interacted with. Users needed a way to remove a rating entirely.
• Improved accessibility ensures screen readers correctly identify the rating slider and ignore decorative text.

♿ Accessibility:

• Proper label association using htmlFor.
• Descriptive aria-label and title for the new "Clear Rating" button.
• Reduced noise for screen readers by hiding decorative markers.

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PR created automatically by Jules for task 16758512822683638821 started by @Gamepulse

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