🎨 Palette: [Add keyboard accessibility to interactive cards]

[Dev22603]

💡 What:
Added complete keyboard accessibility attributes to the clickable interactive cards (ExperienceCard and ProjectCard).

• Added role="button" and tabIndex={0} to allow cards to receive focus via the Tab key.
• Added onKeyDown handlers to simulate onClick when the Enter or Space key is pressed.
• Prevented default scrolling when the Space key is used to trigger a card action.
• Updated event handlers to ignore keystrokes on internal buttons and links (like GitHub/Live Demo).
• Applied focus-visible styles to give users clear visual feedback when interacting with cards via keyboard. Also added to BlogCard.

🎯 Why:
While the div wrapper for cards was visually styled to appear interactive (with hover animations and onClick handlers), it was completely inaccessible to users navigating by keyboard or screen reader. Adding proper roles, focus states, and key down handlers makes these core portfolio elements fully accessible.

📸 Before/After:
Keyboard focus indicators and complete traversal using Tab, Enter, and Space can be seen in the visual verification screenshots/video.

♿ Accessibility:

• Interactive cards now function consistently as buttons for screen readers.
• Keyboard navigation is fully supported for opening modals or navigating to external links.
• Focus styling ensures visual clarity when navigating cards without a mouse.
• Addressed index.css import warning and eslint variable warning.

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PR created automatically by Jules for task 4615950907959942617 started by @Dev22603

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