🎨 Palette: Improve rating UX and header accessibility

[Gamepulse]

I have implemented several micro-UX and accessibility improvements to the GameDetailHeader component:

• Rating UX: Added a 'Clear' button next to the Personal Rating range input, allowing users to unset their rating to null.
• Accessibility:
  • Updated the Favorite button with proper aria-label and aria-pressed attributes.
  • Added a semantic <label> for the Personal Rating range input.
  • Hidden decorative emojis (🌐, 📁, 🎮) from screen readers using aria-hidden="true".
  • Improved keyboard navigation by adding high-contrast focus rings to interactive elements.
• I18n: Added a new clearRating translation key in both English and French.
• Maintenance: Fixed an unrelated TypeScript build error in GameScreenshotsCarousel.tsx (unused variable) to ensure pnpm build passes.

Verified with Playwright screenshots and confirmed that all tests pass.

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PR created automatically by Jules for task 8377836783354180144 started by @Gamepulse

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