polish: Priority 1 improvements - gradients, stats, metadata, footer

✨ Visual Enhancements:
- Unique gradients per tool (green-teal for Vert, orange-pink for Paint, indigo-purple for Pastel)
- Added new gradient utilities for better color differentiation

📊 Stats Section:
- New animated stats component showing "3 Tools, 100% Open Source, ∞ Privacy First"
- Glassmorphism cards with hover effects
- Icon badges for each stat

🔍 Enhanced Metadata:
- Comprehensive Open Graph tags for social sharing
- Twitter Card support
- Enhanced SEO with detailed keywords (vert, paint, pastel)
- Added SVG favicon with gradient toolbox icon
- Viewport meta tag and preconnect optimization

🔗 Improved Footer:
- 3-column responsive layout
- GitHub repository link with icon
- Quick links to all tools (Vert, Paint, Pastel)
- Tool count badge
- Updated tech stack mention (Next.js 16 & Tailwind CSS 4)

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

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

app/page.tsx

@@ -1,5 +1,6 @@
 import AnimatedBackground from '@/components/AnimatedBackground';
 import Hero from '@/components/Hero';
+import Stats from '@/components/Stats';
 import ToolsGrid from '@/components/ToolsGrid';
 import Footer from '@/components/Footer';
 
@@ -8,6 +9,7 @@ export default function Home() {
     <main className="relative min-h-screen">
       <AnimatedBackground />
       <Hero />
+      <Stats />
       <ToolsGrid />
       <Footer />
     </main>