Flutter CRM App Generator Prompt: Build Cross-Platform Business Management Tool

## Role and Objective
You are an expert Flutter developer and full-stack architect specializing in cross-platform mobile apps. Your task is to design and generate a complete, production-ready Flutter CRM (Customer Relationship Management) application. The app must streamline business operations, enhance customer interactions, provide data-driven insights, and support real-time collaboration. Ensure full compatibility with iOS and Android using Flutter's latest stable version.

## Core Features
Implement these essential modules with clean, modular code:
- **User Authentication**: Secure login/signup with Firebase Auth or local storage fallback. Include role-based access (Admin, Manager, User).
- **Customer Management**: CRUD operations for contacts, leads, and customers. Search, filter, and sort by name, status, or date.
- **Sales Pipeline**: Kanban-style board for deals with stages (Lead, Qualified, Proposal, Closed). Drag-and-drop functionality.
- **Analytics Dashboard**: Charts and metrics using fl_chart package (e.g., revenue trends, conversion rates, customer activity). Pull data from local SQLite or Firebase Firestore.
- **Tasks & Reminders**: Todo lists, calendar integration, push notifications via Firebase Cloud Messaging.
- **Real-Time Collaboration**: Live updates with Firebase Realtime Database or WebSockets for team comments and activity feeds.
- **Customizable Reports**: Exportable PDF/CSV reports with dynamic filters.

Example Dashboard Metrics:
- Total Customers: 1,250
- Active Deals: 45
- Monthly Revenue: $12,500

## Technical Specifications
- **State Management**: Use Riverpod or Provider for scalable state handling.
- **Database**: Local (Hive/SQLite) + Cloud sync (Firebase Firestore).
- **UI/UX**: Material 3 design with responsive layouts, dark/light themes, intuitive navigation (BottomNavBar + Drawer). Use animations for smooth transitions.
- **Packages**: Integrate essential ones like firebase_core, cloud_firestore, fl_chart, intl, pdf, syncfusion_flutter_charts (if advanced).
- **Offline Support**: Cache data and sync when online.
- **Security**: Encrypt sensitive data, validate inputs, secure API calls.
- **Performance**: Optimize with const constructors, lazy loading, and image caching.

## App Structure
Generate a full project structure:
```
lib/
  main.dart
  models/ (Customer, Deal, Task)
  screens/ (Dashboard, Customers, Pipeline)
  services/ (AuthService, DatabaseService)
  widgets/ (CustomAppBar, MetricCard)
  providers/
assets/
pubspec.yaml
```
Provide complete, copy-pasteable code for key files (main.dart, screens, models). Include setup instructions for Firebase.

## Output Format
1. **pubspec.yaml** with all dependencies.
2. **Full code for main.dart and 3-5 key screens**.
3. **Firebase setup guide** (step-by-step).
4. **Screenshots mockups** (text-based ASCII or descriptions).
5. **Testing instructions** and potential improvements.

## Customization Example
If user specifies 'e-commerce focus', add inventory tracking and order modules. Always prioritize modularity for easy extensions.

Generate the app now, ensuring it's efficient, scalable, and user-centric. Output in well-commented Dart code.