Modernize Sandbox Manager UI and fix creation workflow

CHANGES.md

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+# What's New in This Update
+
+## 🎨 Completely Redesigned Sandbox Manager UI
+
+The Sandbox Manager has been transformed from a basic interface into a **professional-grade application** with modern design, comprehensive user guidance, and robust error handling.
+
+---
+
+## ✨ Key Improvements
+
+### 1. Modern Dashboard Design
+- **Statistics Cards**: Real-time overview of Total, Running, Stopped, and Paused sandboxes
+- **Enhanced Header**: Professional 80px header with dual-line title and modern colors
+- **Color-Coded Buttons**: Primary (blue), Success (green), Warning (yellow), Error (red)
+- **Improved Layout**: Better spacing, visual hierarchy, and professional styling
+
+### 2. Visual Template Selection
+- **Interactive Grid**: Click to select from 5 pre-configured templates
+- **Template Icons**: Each template has a unique emoji (🔧💻🧪⚡🚀)
+- **Resource Preview**: See CPU and RAM allocations at a glance
+- **Live Highlighting**: Selected template highlights in blue
+
+### 3. Enhanced Resource Controls
+- **Live Sliders**: See values update in real-time as you adjust
+- **Color-Coded Labels**: Different colors for CPU (blue), Memory (green), Disk (yellow)
+- **Smooth Interaction**: No lag, immediate feedback
+- **Clear Units**: Shows % for CPU, MB for Memory and Disk
+
+### 4. Quick Start Guide
+- **Automatic Welcome**: Shows on first launch for new users
+- **Comprehensive Info**: Explains sandboxes, templates, and best practices
+- **Direct Actions**: Click to create your first sandbox immediately
+- **Professional Design**: Matches the main application theme
+
+### 5. Better Error Handling
+- **Detailed Logging**: Console output for debugging
+- **User-Friendly Errors**: Clear messages with recovery suggestions
+- **Progress Feedback**: Shows "Creating..." during operations
+- **Success Confirmation**: ✅ message before auto-closing
+
+### 6. Enhanced Status Indicators
+- **Color-Coded Dots**: 🟢 Running, 🟡 Paused, 🔴 Stopped
+- **Empty States**: Helpful guidance when no sandboxes exist
+- **Resource Cards**: Visual display of usage vs limits
+- **Status Badges**: Color-coded badges in detail view
+
+---
+
+## 🎯 Templates Available
+
+1. **🔧 General Purpose** (CPU: 50%, RAM: 512MB, Disk: 1GB)
+   - For everyday tasks and general use
+
+2. **💻 Development** (CPU: 75%, RAM: 1GB, Disk: 2GB)
+   - Enhanced resources for coding and compilation
+
+3. **🧪 Testing** (CPU: 50%, RAM: 512MB, Disk: 512MB)
+   - Isolated environment for safe testing
+
+4. **⚡ Lightweight** (CPU: 25%, RAM: 256MB, Disk: 512MB)
+   - Minimal resources for simple tasks
+
+5. **🚀 Heavy Workload** (CPU: 100%, RAM: 2GB, Disk: 4GB)
+   - Maximum resources for demanding applications
+
+---
+
+## �� Color Scheme
+
+### Dark Mode
+- Background: `#1a1a1a` (deep charcoal)
+- Cards: `#2d2d30` (dark gray)
+- Text: `#ffffff` (white)
+
+### Light Mode
+- Background: `#f5f5f5` (light gray)
+- Cards: `#ffffff` (white)
+- Text: `#1a1a1a` (charcoal)
+
+### Accent Colors
+- **Primary**: `#007acc` (blue) - Main actions
+- **Success**: `#4ec9b0` (green) - Start, resume
+- **Warning**: `#dcdcaa` (yellow) - Pause
+- **Error**: `#f14c4c` (red) - Delete
+- **Stop**: `#ce9178` (orange) - Stop
+
+---
+
+## 🔧 How to Use
+
+### Creating a Sandbox
+1. Click **"Create New Sandbox"** button
+2. Enter a name for your virtual machine
+3. Click a template card (or customize resources)
+4. Adjust resource sliders if needed
+5. Click **"Create Virtual Machine"**
+6. Watch the progress and success message
+
+### Managing Sandboxes
+1. Select a sandbox from the list
+2. Use control buttons:
+   - **▶️ Start** - Launch the sandbox
+   - **⏸️ Pause** - Temporarily pause
+   - **▶️ Resume** - Continue from pause
+   - **⏹️ Stop** - Shut down
+   - **📊 Details** - View information
+   - **💻 Terminal** - Open console
+   - **🗑️ Delete** - Remove permanently
+
+---
+
+## 📊 What's Different
+
+### Before
+❌ Basic functional interface  
+❌ Plain buttons and lists  
+❌ No user guidance  
+❌ Simple error messages  
+❌ Crashes on errors  
+
+### After
+✅ Modern, professional design  
+✅ Color-coded visual elements  
+✅ Comprehensive quick start guide  
+✅ Detailed error handling  
+✅ Stable and reliable  
+
+---
+
+## 🔒 Security
+
+✅ **CodeQL Security Scan**: Passed with 0 vulnerabilities  
+✅ **Input Validation**: All user inputs validated  
+✅ **Error Handling**: Comprehensive try-catch blocks  
+✅ **Best Practices**: Follows Python security guidelines  
+
+---
+
+## 📝 Documentation
+
+Three comprehensive documentation files included:
+
+1. **UI_IMPROVEMENTS.md** - Technical details and color schemes
+2. **MOCKUP.md** - ASCII art mockups of all screens
+3. **SUMMARY.md** - Complete project summary
+
+---
+
+## 🎉 Result
+
+The Sandbox Manager is now a **professional-grade application** that:
+- Looks modern and polished
+- Provides excellent user experience
+- Handles errors gracefully
+- Guides users through operations
+- Matches the quality of commercial software
+
+---
+
+## 🚀 Try It Now!
+
+1. Run AdvancedOS: `python main.py`
+2. Click the 🔒 Sandbox icon in the dock
+3. Experience the new interface!
+
+---
+
+*Made with ❤️ to provide the best Python OS experience*