feat: set hero section padding to 50px

- Change hero section from pt: {xs: 12, md: 20}, pb: 0 to py: 6.25
- py: 6.25 equals 50px (6.25 × 8px)
- Applies 50px padding to both top and bottom of hero section

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

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

app/[locale]/page.tsx

@@ -75,8 +75,7 @@ export default function Home() {
         sx={{
           background: 'linear-gradient(135deg, #009688 0%, #00796B 100%)',
           color: 'white',
-          pt: { xs: 12, md: 20 },
-          pb: 0,
+          py: 6.25,
           textAlign: 'center',
           position: 'relative',
           overflow: 'hidden',