feat: add git icons to View on Dev links

- Add file-plus icon to Hero button
- Add file-plus icon to Footer link
- Icons change color on hover (gray → purple)
- Better visual indication for repository links

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude <noreply@anthropic.com>

components/Footer.tsx

@@ -36,6 +36,9 @@ export default function Footer() {
             rel="noopener noreferrer"
             className="group flex items-center gap-3 px-4 py-2 rounded-full border border-gray-700 hover:border-purple-400 transition-all duration-300"
           >
+            <svg className="w-5 h-5 text-gray-400 group-hover:text-purple-400 transition-colors" fill="none" stroke="currentColor" viewBox="0 0 24 24">
+              <path strokeLinecap="round" strokeLinejoin="round" strokeWidth={2} d="M9 13h6m-3-3v6m5 5H7a2 2 0 01-2-2V5a2 2 0 012-2h5.586a1 1 0 01.707.293l5.414 5.414a1 1 0 01.293.707V19a2 2 0 01-2 2z" />
+            </svg>
             <span className="text-base text-gray-300 group-hover:text-purple-400 transition-colors font-medium">
               View on Dev
             </span>