Flutter WebView App with Notifications

I want my existing website wrapped into a sleek, Flutter-based Android WebView application. The end result should feel native: fast load times, smooth scrolling, and an interface that scales cleanly across every current Android device.

Core experience
• Modern, responsive WebView built in Flutter
• Splash screen that blends with my brand identity
• Pull-to-refresh gesture
• Full file upload and download support
• Automatic internet-connection check and graceful offline handling
• Custom app icon and app name
• Signed, ready-to-install APK plus the complete, well-commented Flutter project

Extra feature
Push notifications are essential, triggered directly by events on my website (no in-app messaging required).

What I will provide
– The site URL, final app name, and logo assets
– Any additional design guidance you might need

Please share a brief outline of how you will implement the WebView, which notification service you prefer (e.g., Firebase Cloud Messaging), and a rough timeline to delivery. If you have demo apps or code snippets, feel free to include them—the cleaner and more optimized, the better.