🎨 Palette: Accessibility and UX improvements for Game Detail

[Gamepulse]

This PR implements several micro-UX and accessibility improvements in the GameDetailHeader component to make the interface more intuitive and inclusive.

💡 What:

1. Accessibility: Added aria-hidden="true" to the decorative "PPGM" branding mask on game covers.
2. Accessibility: Added aria-label to the favorite toggle button for better screen reader support.
3. UX & Accessibility: Replaced the rating display with a proper <label> associated with the range input via htmlFor/id.
4. UX: Added a "Clear All" button (✕) next to the personal rating, allowing users to reset their rating to an unset state.
5. Build: Removed an unused hasIgdbId state in GameScreenshotsCarousel.tsx that was causing tsc build failures.

🎯 Why:

• Decorative text overlays can be confusing for screen reader users if not hidden.
• Icon-only buttons need explicit labels for accessibility.
• Standard HTML range inputs don't have a built-in "null" state, so a clear button is required to allow users to remove a rating.
• Fixing the build error ensures the project remains maintainable and deployable.

♿ Accessibility:

• Improved form control labeling.
• Enhanced screen reader context for interactive elements.
• Reduced noise by hiding decorative elements.

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PR created automatically by Jules for task 7200428472585812498 started by @Gamepulse

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