Deployment Prep

Prepare this Lovable app for production deployment:\n\n1. Environment variables:\n   - Verify all Supabase credentials use environment variables (not hardcoded)\n   - Ensure NEXT_PUBLIC_ prefix only on client-safe vars\n   - Create a .env.example listing every required variable\n\n2. Error handling:\n   - Add global error boundary component that shows a friendly error page\n   - Add try/catch to all Supabase queries with user-facing error messages\n   - Log errors to console in development, suppress in production\n\n3. Performance:\n   - Add loading.tsx files for route-level suspense boundaries\n   - Lazy load heavy components (charts, rich text editors)\n   - Optimize images with next/image where applicable\n\n4. SEO basics:\n   - Add metadata (title, description) to each page\n   - Add Open Graph tags for {{app_name}}\n   - Generate a sitemap.xml\n\n5. Security:\n   - Verify all RLS policies are active\n   - Remove any console.log statements with sensitive data\n   - Set secure cookie options for auth tokens\n\nDo not change features or UI. Only add production infrastructure.