🎨 Palette: Enhance card keyboard accessibility

[Dev22603]

💡 What: Added comprehensive keyboard navigation support to the interactive ProjectCard and ExperienceCard components.
🎯 Why: These cards act as interactive elements (clickable motion.divs) but previously lacked keyboard focus capabilities and keyboard-activated click handlers, making them inaccessible to keyboard and screen reader users.
♿ Accessibility:

• Added role="button" for semantic meaning.
• Added tabIndex={0} to place the items in the standard tab flow.
• Implemented onKeyDown listeners to trigger the existing onClick logic when users press 'Enter' or 'Space'.
• Added robust visual focus feedback using Tailwind's focus-visible:ring-2, focus-visible:ring-primary, and focus-visible:outline-none classes.

This change ensures that all primary interaction paths on the portfolio are fully navigable via keyboard alone. Additionally, fixed a minor CSS syntax warning in index.css by elevating the Google Fonts @import rule above @import "tailwindcss"; to keep builds warning-free.

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PR created automatically by Jules for task 14529728975802440171 started by @Dev22603

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