🎨 Palette: Add keyboard accessibility to interactive cards

[Dev22603]

💡 What

Added full keyboard accessibility to the interactive ProjectCard and ExperienceCard components, which were previously built using motion.div with only onClick handlers.

🎯 Why

Users relying on keyboard navigation (or screen readers) could not interact with or even tab to the project and experience cards to open their respective modals. By making these cards accessible, all users can now explore the portfolio content seamlessly.

📸 Before/After

• Before: Tabbing through the page skipped over the project and experience cards entirely. Pressing Enter/Space on them did nothing.
• After: Cards now receive keyboard focus with a clear blue ring, and can be activated using the Enter or Space keys. (Visual verification screenshot available locally).

♿ Accessibility

• Added role="button" to inform screen readers of the interaction type.
• Added tabIndex={0} to include the cards in the document's tab order.
• Added onKeyDown handlers to simulate clicks when Enter or Space is pressed.
• Added e.preventDefault() for the Space key to prevent unintended page scrolling.
• Added focus-visible:ring-2 focus-visible:ring-blue-500 focus-visible:outline-none Tailwind classes to provide a clear, accessible visual indicator when focused via keyboard.

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PR created automatically by Jules for task 7660821208236307540 started by @Dev22603

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