🎨 Palette: Accessibility and UX improvements

[Gamepulse]

This PR introduces several micro-UX and accessibility enhancements across the game management interface:

1. Rating UX: Added a localized "Clear Rating" button next to the personal rating slider. Since HTML range inputs can't represent a 'null' state, this provides a clear way for users to unset their rating.
2. Keyboard Accessibility:
   • Converted the clickable folder path in the game detail view from a <p> tag to a semantic <button type="button">.
   • Added descriptive aria-label to the folder path button, including the full path.
   • Ensured all icon-only buttons (Favorite, Quick Assign) have proper aria-label and title attributes.
   • Added aria-pressed to the Favorite button to communicate state to screen readers.
3. Screen Reader Polish: Wrapped decorative emojis (🌐, 📁, 🎮) in <span aria-hidden="true"> to prevent redundant or confusing announcements.
4. General Maintenance: Fixed a TypeScript lint error regarding an unused variable in GameScreenshotsCarousel.tsx to ensure the build passes.
5. Internationalization: Added and used new translation keys for 'clearRating' and 'quickAssign' in both English and French.

Verified with pnpm build, pnpm test, and Playwright visual inspection.

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PR created automatically by Jules for task 3729346484541871387 started by @Gamepulse

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