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

version.json

@@ -1,14 +1,18 @@
 {
-  "version": "1.1.0",
+  "version": "1.2.0-tablet",
   "name": "spelling-practice-app",
-  "description": "A comprehensive educational application for spelling practice",
-  "lastUpdated": "August 13, 2025",
+  "description": "A comprehensive educational application for spelling practice with tablet handwriting support",
+  "lastUpdated": "October 2, 2025",
   "releaseNotes": [
-    "Fixed analytics graph display issues",
-    "Fixed results and sessions tabs data display",
-    "Added robust error handling for file operations",
-    "Improved session data compatibility",
-    "Added API test page for easier debugging",
-    "Enhanced documentation with troubleshooting guide"
+    "Added native tablet handwriting recognition support",
+    "Integrated Web Handwriting API for modern browsers",
+    "Added Windows Ink Platform compatibility",
+    "Enhanced pointer events for pressure-sensitive stylus",
+    "Added touch events optimization for tablets",
+    "Improved UI for tablet-friendly interface",
+    "Added handwriting canvas with enhanced recognition",
+    "Created comprehensive pattern matching for spelling words",
+    "Added tablet detection and feature optimization",
+    "Enhanced recognition accuracy for educational content"
   ]
 }