🎨 Palette: UX and Accessibility Improvements

[Gamepulse]

I have implemented several micro-UX and accessibility improvements:

1. Safety: Added a confirmation dialog before deleting a game in GameDetail.tsx to prevent accidental data loss.
2. Control: Added a "Clear Rating" button in GameDetailHeader.tsx. Since the HTML5 range input used for personal ratings cannot represent a null state, this button allows users to unset their rating entirely.
3. Accessibility:
   • Added aria-label to the Quick Assign buttons in GameCard.tsx.
   • Added aria-label to the Favorite toggle in GameDetailHeader.tsx.
   • Added aria-label to the executable path clear button in GameDetail.tsx.
4. Internationalization: Added clearRating and quickAssignPlatform translation keys for both English and French.
5. Code Quality: Removed an unused state variable hasIgdbId in GameScreenshotsCarousel.tsx that was causing the production build to fail.

All changes are under 50 lines per component and follow the project's existing patterns. Verified with pnpm test and pnpm build.

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PR created automatically by Jules for task 7494303666254535233 started by @Gamepulse

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