🎨 Palette: Improve accessibility and fix build error

[Gamepulse]

This PR introduces several micro-UX and accessibility improvements to the Pascal Game Manager:

1. Accessibility (A11y): Converted interactive elements (tags, metadata, status badges) from <span> with role="button" to semantic <button type="button">. This provides native keyboard support and better screen reader interaction.
2. Context for Screen Readers: Added descriptive aria-label attributes to interactive elements, ensuring users with assistive technology understand the purpose of each button (e.g., "Filter by tag: RPG").
3. Visual Focus States: Implemented focus-visible:ring-2 styles to provide clear visual feedback during keyboard navigation.
4. Build Fix: Removed an unused hasIgdbId state variable in GameScreenshotsCarousel.tsx that was causing pnpm build (which includes strict TypeScript checks) to fail.
5. Robustness: Ensured interactive badges on GameCard have proper z-indexing to remain clickable over cover images.

These changes ensure the application is more accessible, follows semantic HTML best practices, and maintains a healthy build state.

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PR created automatically by Jules for task 643897840873353350 started by @Gamepulse

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