fix: improve card hover contrast and update Figlet icon

Card Hover Improvements:
- Increased gradient overlay opacity from 10% to 30% on hover
- Much better contrast and visibility
- Cards now have more prominent hover state
- Better user feedback on interaction

Figlet Icon Update:
- Changed from document icon to a-arrow-up icon
- Letter 'A' with upward arrow representing text/typography
- Better represents ASCII art text generation

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

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

components/ToolCard.tsx

@@ -30,7 +30,7 @@ export default function ToolCard({ title, description, icon, url, gradient, acce
       <div className="glass relative overflow-hidden rounded-2xl p-8 h-full transition-all duration-300 hover:shadow-2xl">
         {/* Gradient overlay on hover */}
         <div
-          className={`absolute inset-0 opacity-0 group-hover:opacity-10 transition-opacity duration-300 ${gradient}`}
+          className={`absolute inset-0 opacity-0 group-hover:opacity-30 transition-opacity duration-300 ${gradient}`}
         />
 
         {/* Glow effect */}