feat: Complete tablet UI overhaul with popup menu system and help bubble

Major Changes:
- 🪟 Popup Menu System: Converted slide-down navigation to draggable, minimizable popup window
- ❓ Help Bubble: Added contextual help system for admin dashboard (accessible via ? bubble)
- 🎨 Universal Theme Engine: All elements now properly match selected theme across all panels
- 📱 Enhanced Tablet Support: Comprehensive touch gestures, handwriting recognition, and Apple Pencil optimization
- 🖊️ Unified Write Mode: Combined handwriting and keyboard input with large canvas interface

Technical Implementation:
- Draggable popup with minimize/restore functionality and boundary constraints
- Dynamic theme switching using CSS variables throughout all components
- Help system with modal overlay and keyboard shortcuts (ESC to close)
- Responsive design optimizations for mobile, tablet, and desktop
- Comprehensive CSS overrides to eliminate hardcoded colors
- JavaScript fixes for canvas stroke colors and input styling

UI/UX Improvements:
- Clean admin dashboard without instruction clutter
- Professional popup interface with smooth animations
- Better contrast and readability across all themes (default, playground, chalkboard, galaxy, nature)
- Improved accessibility with proper focus management
- Enhanced mobile responsiveness with touch-optimized controls

Files Modified:
- Menu system: tablet-menu.js, tablet-menu.css
- Theme engine: styles.css, themes integration
- Admin interface: index.html, ui.js
- Input systems: game.js, unified-write.js, handwriting.js
- Authentication: auth.js with tablet menu cleanup

TABLET-TEST-DEPLOYMENT.md

@@ -0,0 +1,115 @@
+# 📱 Tablet Handwriting Recognition Test Deployment
+
+## 🚀 Quick Deploy
+
+### Pull and Run the Test Image:
+```bash
+# Pull the test image
+docker pull ghcr.io/nmemmert/spelling:test
+
+# Run the container
+docker run -d -p 80:3000 --name spelling-tablet-test ghcr.io/nmemmert/spelling:test
+```
+
+### Alternative with Docker Compose:
+```yaml
+version: '3.8'
+services:
+  spelling-test:
+    image: ghcr.io/nmemmert/spelling:test
+    ports:
+      - "80:3000"
+    restart: unless-stopped
+    labels:
+      - "test-version=1.2.0-tablet"
+      - "features=handwriting-recognition"
+```
+
+## 🖊️ What's Included in This Test Build:
+
+### ✅ Native Tablet Support:
+- **Web Handwriting API** integration (Edge/Chrome experimental)
+- **Windows Ink Platform** compatibility
+- **Pointer Events API** with pressure sensitivity
+- **Touch Events API** optimization
+- **Force Touch** support (3D Touch devices)
+
+### 🎯 Enhanced Recognition Features:
+- **Multi-algorithm recognition** chain
+- **Contextual word matching** for spelling practice
+- **Pressure-sensitive** stroke analysis
+- **Timing-based** pattern recognition
+- **Dictionary-based** post-processing
+
+### 📝 Tablet-Optimized UI:
+- **Touch-friendly** interface elements
+- **Stylus-optimized** canvas
+- **Responsive** tablet layouts
+- **Visual feedback** for recognition status
+- **Auto-detection** of native capabilities
+
+## 🧪 Testing Instructions:
+
+### 1. **Access the Application:**
+- Open your tablet browser
+- Navigate to your server (e.g., `http://your-server/`)
+- Look for "📱 Native Tablet Recognition" status
+
+### 2. **Enable Browser Features (if needed):**
+- **Edge:** `edge://flags/` → Enable "Experimental Web Platform features"
+- **Chrome:** `chrome://flags/` → Enable "Experimental Web Platform features"
+- **Safari:** Enable experimental features in settings
+
+### 3. **Test Handwriting Recognition:**
+- Switch to "✏️ Write" mode
+- Draw letters/words on the canvas with stylus or finger
+- Click "🔍 Recognize" button
+- Test words: "Love", "Boy", "Cat", "Make", "Time"
+
+### 4. **Check Native Features:**
+- Look for pressure sensitivity (if using stylus)
+- Test different drawing speeds
+- Try both print and cursive writing
+- Check recognition accuracy vs. desktop
+
+## 📊 Expected Results:
+
+### **On Modern Tablets:**
+- ✅ Pointer Events API should work
+- ✅ Touch Events should be detected
+- 🔧 Web Handwriting API (needs experimental flags)
+- ✅ Much better recognition accuracy than desktop
+
+### **Performance Indicators:**
+- **Recognition Status:** Should show "Native" or "Enhanced"
+- **Pressure Data:** Available with compatible stylus
+- **Touch Optimization:** Smooth drawing experience
+- **Word Accuracy:** Significantly improved for spelling words
+
+## 🐛 Troubleshooting:
+
+### If Recognition is Poor:
+1. Enable experimental browser features
+2. Use a compatible stylus (Surface Pen, Apple Pencil, S-Pen)
+3. Write more slowly and clearly
+4. Try print letters instead of cursive
+
+### If No Native Support:
+- Check browser compatibility
+- Enable experimental flags
+- Update to latest browser version
+- Test on different tablet models
+
+## 🔗 Image Details:
+- **Image:** `ghcr.io/nmemmert/spelling:test`
+- **Version:** `1.2.0-tablet`
+- **Features:** Native handwriting + Enhanced fallback
+- **Build Date:** October 2, 2025
+
+## 📞 Feedback:
+Test the handwriting recognition and report:
+- Which device/browser combination
+- Native API detection results
+- Recognition accuracy for different words
+- Any pressure sensitivity detected
+- Overall user experience improvements