feat: Implement recovery bin feature with file recovery and deletion

- Added RecoveryService to manage deleted files and their recovery.
- Introduced DeletedFile model to represent files in the recovery bin.
- Created RecoveryScreen to display and manage deleted files.
- Integrated theme service and notification service for enhanced user experience.
- Added DownloadProgressScreen to show download progress with speed and ETA.
- Implemented CircularProgressWidget for a smooth progress indicator.
- Updated file download logic to include notifications for progress and completion.
- Added intl package for date formatting in recovery service.

Author: gopi2401

FEATURES_IMPLEMENTED.md

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+# Implementation Summary: 4 New Features ✨
+
+## Files Created
+
+### Services
+1. **[lib/services/theme_service.dart](lib/services/theme_service.dart)** ⭐
+   - Dark/Light theme management with GetX
+   - Smooth theme transitions with adaptive_theme
+   - Light and dark theme customization
+   - Theme persistence
+
+2. **[lib/services/notification_service.dart](lib/services/notification_service.dart)** 🔔
+   - Smart notification channels for different download types
+   - Progress, completion, and error notifications
+   - Support for Instagram, WhatsApp, YouTube, Story downloads
+
+3. **[lib/services/recovery_service.dart](lib/services/recovery_service.dart)** ♻️
+   - File recovery management with 30-day window
+   - Soft delete mechanism
+   - Auto-cleanup of expired files
+   - GetX controller with observable list
+
+### Screens/UI Components
+4. **[lib/screens/download_progress_screen.dart](lib/screens/download_progress_screen.dart)** 🎬
+   - Download progress dialog
+   - DownloadProgressController for state management
+   - Shows progress, speed, and ETA
+
+5. **[lib/screens/recovery_screen.dart](lib/screens/recovery_screen.dart)** 🗑️
+   - Recovery bin UI
+   - File recovery and permanent deletion
+   - Visual indicators for expiration status
+   - GetX reactive updates
+
+6. **[lib/widgets/circular_progress_widget.dart](lib/widgets/circular_progress_widget.dart)** 📊
+   - Animated circular progress indicator
+   - Color progression (Red → Orange → Amber → Green)
+   - Smooth animations with SingleTickerProviderStateMixin
+   - Real-time speed and ETA display
+
+### Documentation & Examples
+7. **[lib/examples/feature_usage_guide.dart](lib/examples/feature_usage_guide.dart)** 📖
+   - Comprehensive usage examples for all 4 features
+   - Integration examples
+   - Class definitions and code snippets
+
+8. **[IMPLEMENTATION_GUIDE.md](IMPLEMENTATION_GUIDE.md)** 📚
+   - Detailed documentation of all features
+   - How each feature works
+   - File structure
+   - Testing checklist
+   - Future enhancement ideas
+
+## Files Modified
+
+1. **[lib/main.dart](lib/main.dart)** 🔧
+   - Added imports for new services and screens
+   - Updated main() to initialize services
+   - Integrated AdaptiveTheme wrapper
+   - Updated drawer with Recovery Bin and Theme Toggle
+   - Added RecoveryScreenWrapper class
+
+2. **[lib/services/file_download.dart](lib/services/file_download.dart)** 🔄
+   - Added NotificationService integration
+   - Added RecoveryService integration
+   - Support for DownloadType parameter
+   - Speed and ETA calculation methods
+   - Soft delete capability
+
+3. **[pubspec.yaml](pubspec.yaml)** 📦
+   - Added `intl: ^0.19.0` for date formatting
+
+## Feature Summary
+
+### 1. 🌓 Dark/Light Theme Toggle
+- **Location**: Drawer menu
+- **Features**: 
+  - Instant theme switching with animations
+  - Persists user preference
+  - Custom Material Design 3 theming
+  - Full UI support (inputs, buttons, app bar)
+
+### 2. 🎬 Download Progress Animations
+- **Location**: Download dialog
+- **Features**:
+  - Circular progress indicator with color changes
+  - Real-time speed display
+  - ETA calculation and display
+  - Cancel button
+  - Smooth animations
+
+### 3. ♻️ Undo/Recovery System
+- **Location**: Drawer → Recovery Bin
+- **Features**:
+  - 30-day recovery window
+  - Shows deleted files with metadata
+  - Recover or permanently delete
+  - Auto-cleanup after 30 days
+  - Badge showing count of deleted files
+
+### 4. 🔔 Smart Notifications
+- **Channels**:
+  - Instagram Downloads (instagram_downloads)
+  - WhatsApp Downloads (whatsapp_downloads)
+  - YouTube Downloads (youtube_downloads)
+  - Story Downloads (story_downloads)
+  - Download Errors (download_errors)
+- **Features**:
+  - Progress notifications with % display
+  - Completion notifications with thumbnails
+  - Error notifications with custom messages
+  - Type-specific notification styling
+
+## Dependencies
+
+### New Dependency
+```yaml
+intl: ^0.19.0  # For date formatting
+```
+
+### Existing Dependencies Used
+- `adaptive_theme: ^3.7.0` (enhanced)
+- `get: ^4.6.6` (state management)
+- `flutter_local_notifications: ^19.4.0` (notifications)
+- `path_provider: ^2.1.1` (file storage)
+- `dio: ^5.4.0` (download management)
+
+## Quick Start
+
+### 1. Update Dependencies
+```bash
+flutter pub get
+```
+
+### 2. Theme Toggle
+- Open drawer
+- Tap "Dark Mode" / "Light Mode"
+- Theme persists automatically
+
+### 3. Download Progress
+- Click download button
+- See animated circular progress dialog
+- Monitor speed and ETA
+
+### 4. Recovery Bin
+- Delete a file (moved to recovery)
+- Open drawer → Recovery Bin
+- Recover within 30 days
+- Permanent delete available
+
+### 5. Smart Notifications
+- Notifications appear per download type
+- Different channels ensure proper organization
+- Progress updates during download
+- Completion notification when done
+
+## Architecture
+
+```
+Services (GetX Controllers)
+├── ThemeService
+├── NotificationService  
+├── RecoveryService
+└── FileDownload (updated)
+
+Screens
+├── DownloadProgressScreen
+└── RecoveryScreen
+
+Widgets
+└── CircularProgressWidget
+
+UI Integration
+└── Main Drawer with all features
+```
+
+## State Management
+
+- **GetX** for all state management
+- **Observables** for reactive UI updates
+- **Permanent** services for app-wide access
+- **Controllers** for controller-specific state
+
+## Testing
+
+Run the following to verify implementation:
+
+```bash
+# Verify build
+flutter clean
+flutter pub get
+flutter analyze
+
+# Run app
+flutter run
+```
+
+## Future Enhancements
+
+1. Pause/Resume downloads
+2. Batch download management
+3. Custom notification sounds
+4. Cloud sync for recovery files
+5. Storage analytics dashboard
+6. Download history with search
+7. Multiple theme presets
+8. Notification action buttons
+
+## Known Limitations
+
+- Recovery files stored locally (no cloud sync yet)
+- 30-day cleanup is not real-time (runs on app start)
+- Notifications Android 8.0+ (API 26+)
+
+## Support
+
+For issues or questions, refer to:
+- `IMPLEMENTATION_GUIDE.md` - Detailed documentation
+- `lib/examples/feature_usage_guide.dart` - Code examples
+- Individual file comments for specific functionality
+
+---
+
+**Status**: ✅ Complete and Production Ready  
+**Created**: March 2, 2026  
+**By**: GitHub Copilot
+
+All features are fully integrated and ready for use!