Add Advanced AI Analytics Dashboard with Floating Menu Navigation

This major update introduces a comprehensive analytics system and modern navigation design:

🧠 Advanced AI Analytics System:
- FinancialInsight entity with 15+ insight types and severity levels
- FinancialGoal, SpendingPattern, and SpendingForecast entities for comprehensive tracking
- AdvancedAnalyticsService with intelligent financial analysis algorithms
- AnalyticsFragment with interactive dashboard and real-time health scoring
- InsightAdapter and InsightDetailsDialogFragment for detailed insight exploration
- AnalyticsViewModel with financial health calculation (savings rate, goal progress, expense stability)

🎨 Modern Navigation Design:
- Removed toolbar for clean, full-screen experience
- Added floating menu button (⋮) in top-right corner for additional features
- Maintained 5-tab bottom navigation limit (Overview, Transactions, Loans, Budget, Analytics)
- Floating menu provides access to Settings, Statistics, Store Management, Export, Backup, About
- Clean Material Design 3 interface without cluttered toolbar

🗄️ Database Enhancements:
- Upgraded to database version 18 with migration support
- Added 4 new analytics entities with comprehensive DAOs
- TypeConverters for complex data types (InsightType, GoalType, Severity enums)
- Serializable entities for dialog fragment data passing

📊 Technical Architecture:
- MVVM pattern with AnalyticsViewModelFactory
- Repository pattern ready for analytics data management
- Coroutines-based async operations for smooth performance
- LiveData observers for reactive UI updates
- Error handling and loading states throughout

🔧 UI/UX Improvements:
- SwipeRefreshLayout for manual analytics refresh
- Progress bars and status indicators for financial health scoring
- Insight categorization with color-coded severity levels
- Interactive cards with click handlers for detailed views
- Snackbar feedback for user actions

📝 Documentation:
- Comprehensive README update with all new features
- Detailed analytics system documentation
- Navigation design explanations
- Technical architecture overview

This release transforms CashInCashOut into an advanced financial analytics platform while maintaining the clean, intuitive design users expect.

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

Co-Authored-By: Claude <[email protected]>

Author: Thomas