🎨 Palette: [UX improvement] Make ProjectCard keyboard accessible

[Dev22603]

💡 What

Added keyboard accessibility (role="button", tabIndex={0}, onKeyDown handlers for Enter/Space, and focus-visible styling) and aria-label to the ProjectCard component.

🎯 Why

The ProjectCard component used a motion.div as an interactive, clickable card but lacked the necessary attributes and handlers to be accessible via keyboard navigation. This prevented users relying on keyboards or assistive technologies from interacting with or selecting projects.

📸 Before/After

Video verification and screenshots successfully captured the new focus-visible:ring-2 focus-visible:ring-indigo-500 outline appearing when navigating to the project card via the Tab key.

♿ Accessibility

• Added role="button" and tabIndex={0} to the parent motion element.
• Added onKeyDown event handler to simulate a click when 'Enter' or 'Space' is pressed (preventing default scrolling for space).
• Added aria-label dynamic description for better screen reader context (View details for ${project.name}).
• Added a focus-visible state style to provide a clear, visible focus indicator.

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PR created automatically by Jules for task 16610858300498030884 started by @Dev22603

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