Add theme management and settings functionality

- Introduced `ThemeManager` to handle application themes using `ttkthemes`.
- Added `SettingsWindow` for user preferences including theme selection and UI settings.
- Integrated theme selection into the main application with a menu for quick access.
- Enhanced UI components with custom styles based on the selected theme.
- Implemented tooltips for better user guidance across various UI elements.
- Updated dependencies to include `ttkthemes` for improved visual appeal.

docs/README.md

@@ -1,21 +1,27 @@
 # TheChart Documentation
 
-Welcome to TheChart documentation! This guide will help you navigate the available documentation.
+Welcome to TheChart documentation! This guide will help you navigate the available documentation for the modern medication tracking application.
 
 ## 📖 Documentation Index
 
 ### For Users
 - **[README.md](../README.md)** - Quick start guide and installation
-- **[Features Guide](FEATURES.md)** - Complete feature documentation
+- **[Features Guide](FEATURES.md)** - Complete feature documentation including new UI/UX improvements
+  - Modern Theme System (8 Professional Themes)
+  - Advanced Keyboard Shortcuts
+  - Smart Tooltip System
   - Modular Medicine System
   - Advanced Dose Tracking
   - Graph Visualizations
   - Data Management
-  - Keyboard Shortcuts
 - **[Keyboard Shortcuts](KEYBOARD_SHORTCUTS.md)** - Comprehensive shortcut reference
-  - File operations shortcuts
-  - Data management shortcuts
-  - Navigation shortcuts
+  - File operations shortcuts (Ctrl+S, Ctrl+Q, Ctrl+E)
+  - Data management shortcuts (Ctrl+N, Ctrl+R, F5)
+  - Navigation shortcuts (Ctrl+M, Ctrl+P, F1, F2)
+- **[Export System](EXPORT_SYSTEM.md)** - Data export functionality and formats
+  - JSON, XML, and PDF export options
+  - Graph visualization inclusion
+  - Export manager architecture
 
 ### For Developers
 - **[Development Guide](DEVELOPMENT.md)** - Development setup and testing
@@ -26,53 +32,69 @@ Welcome to TheChart documentation! This guide will help you navigate the availab
 
 ### Project History
 - **[Changelog](CHANGELOG.md)** - Version history and feature evolution
-  - Recent updates and improvements
-  - Migration notes
-  - Future roadmap
+  - Recent UI/UX overhaul (v1.9.5)
+  - Keyboard shortcuts system (v1.7.0)
+  - Medicine and dose tracking improvements
+  - Migration notes and future roadmap
 
 ## 🚀 Quick Navigation
 
 ### Getting Started
 1. **Installation**: See [README.md - Installation](../README.md#installation)
 2. **First Run**: See [README.md - Running the Application](../README.md#running-the-application)
-3. **Key Features**: See [FEATURES.md](FEATURES.md)
+3. **UI/UX Features**: See [FEATURES.md - Modern UI/UX System](FEATURES.md#-modern-uiux-system-new-in-v195)
+
+### Using the Application
+1. **Theme Selection**: See [FEATURES.md - Settings and Theme Management](FEATURES.md#️-settings-and-theme-management)
+2. **Keyboard Shortcuts**: See [KEYBOARD_SHORTCUTS.md](KEYBOARD_SHORTCUTS.md)
+3. **Medicine Management**: See [FEATURES.md - Modular Medicine System](FEATURES.md#-modular-medicine-system)
+4. **Dose Tracking**: See [FEATURES.md - Advanced Dose Tracking](FEATURES.md#-advanced-dose-tracking)
+5. **Data Export**: See [EXPORT_SYSTEM.md](EXPORT_SYSTEM.md)
 
 ### Development
 1. **Setup**: See [DEVELOPMENT.md - Development Environment Setup](DEVELOPMENT.md#development-environment-setup)
 2. **Testing**: See [DEVELOPMENT.md - Testing Framework](DEVELOPMENT.md#testing-framework)
-3. **Contributing**: See [DEVELOPMENT.md - Development Workflow](DEVELOPMENT.md#development-workflow)
+3. **Architecture**: See [FEATURES.md - Technical Architecture](FEATURES.md#technical-architecture)
+4. **Contributing**: See [DEVELOPMENT.md - Development Workflow](DEVELOPMENT.md#development-workflow)
 
-### Advanced Usage
-1. **Medicine Management**: See [FEATURES.md - Modular Medicine System](FEATURES.md#-modular-medicine-system)
-2. **Dose Tracking**: See [FEATURES.md - Advanced Dose Tracking](FEATURES.md#-advanced-dose-tracking)
-3. **Visualizations**: See [FEATURES.md - Enhanced Graph Visualization](FEATURES.md#-enhanced-graph-visualization)
+## 📋 What's New in Documentation
 
-## 📋 Documentation Standards
+### Recent Updates (v1.9.5)
+- **Consolidated Structure**: Merged UI improvements into main features documentation
+- **Enhanced Features Guide**: Added comprehensive UI/UX documentation
+- **Updated Changelog**: Detailed UI/UX overhaul documentation
+- **Improved Navigation**: Better cross-referencing between documents
 
-All documentation follows these principles:
-- **Clear Structure**: Hierarchical organization with clear headings
-- **Practical Examples**: Code snippets and usage examples
-- **Up-to-date**: Synchronized with current codebase
-- **Comprehensive**: Covers all major features and workflows
-- **Cross-referenced**: Links between related sections
+### Documentation Highlights
+- **Professional UI/UX**: Complete documentation of the new theme system
+- **Keyboard Efficiency**: Comprehensive shortcut system documentation
+- **Developer-Friendly**: Enhanced development and testing documentation
+- **User-Focused**: Clear separation of user vs developer documentation
 
 ## 🔍 Finding Information
 
 ### By Topic
 - **Installation & Setup** → [README.md](../README.md)
+- **UI/UX and Themes** → [FEATURES.md - Modern UI/UX System](FEATURES.md#-modern-uiux-system-new-in-v195)
 - **Feature Usage** → [FEATURES.md](FEATURES.md)
+- **Keyboard Shortcuts** → [KEYBOARD_SHORTCUTS.md](KEYBOARD_SHORTCUTS.md)
+- **Data Export** → [EXPORT_SYSTEM.md](EXPORT_SYSTEM.md)
 - **Development** → [DEVELOPMENT.md](DEVELOPMENT.md)
 - **Version History** → [CHANGELOG.md](CHANGELOG.md)
 
 ### By User Type
 - **End Users** → Start with [README.md](../README.md), then [FEATURES.md](FEATURES.md)
-- **Developers** → [DEVELOPMENT.md](DEVELOPMENT.md) and [CHANGELOG.md](CHANGELOG.md)
+- **Power Users** → [KEYBOARD_SHORTCUTS.md](KEYBOARD_SHORTCUTS.md) and [EXPORT_SYSTEM.md](EXPORT_SYSTEM.md)
+- **Developers** → [DEVELOPMENT.md](DEVELOPMENT.md) and [FEATURES.md - Technical Architecture](FEATURES.md#technical-architecture)
 - **Contributors** → All documentation, especially [DEVELOPMENT.md](DEVELOPMENT.md)
 
 ### By Task
 - **Install TheChart** → [README.md - Installation](../README.md#installation)
+- **Change Theme** → [FEATURES.md - Settings and Theme Management](FEATURES.md#️-settings-and-theme-management)
+- **Learn Shortcuts** → [KEYBOARD_SHORTCUTS.md](KEYBOARD_SHORTCUTS.md)
 - **Add New Medicine** → [FEATURES.md - Modular Medicine System](FEATURES.md#-modular-medicine-system)
 - **Track Doses** → [FEATURES.md - Advanced Dose Tracking](FEATURES.md#-advanced-dose-tracking)
+- **Export Data** → [EXPORT_SYSTEM.md](EXPORT_SYSTEM.md)
 - **Run Tests** → [DEVELOPMENT.md - Testing Framework](DEVELOPMENT.md#testing-framework)
 - **Deploy Application** → [README.md - Deployment](../README.md#deployment)