Add Interactive Exercises and Complete Exercise Coverage for 50-Day Curriculum

[Copilot]

This PR implements comprehensive interactive exercises to enhance the language learning experience beyond the current text-based lessons. The implementation includes three distinct exercise types with full accessibility and multilingual support, plus complete exercise coverage for the entire 50-day curriculum.

Features Added

🎯 Interactive Exercise System

• Drag-and-Drop Exercises: Interactive word placement exercises where users drag words from a word bank to complete sentences. Includes mouse, keyboard, and touch interaction support with visual feedback and highlighted drop zones.
• Fill-in-the-Blank Exercises: Text input exercises for completing phrases with missing words. Features interactive text inputs with real-time validation feedback, optional word bank with click-to-insert functionality, and hints system for guided learning.
• Matching Games: Two-column matching interface for connecting related items with visual selection states, match creation workflow, and comprehensive keyboard navigation support.

📚 Complete Exercise Coverage

• 250 Exercise Files: Generated exercise files for all 50 days in all 5 languages (English, Spanish, Portuguese, French, German)
• Consistent Structure: All files follow the established day1 model with properly formatted drag-drop, fill-blank, and matching exercises
• Themed Content Progression: Exercises grouped by learning themes progressing through the curriculum:
  • Days 1-10: Basic greetings and daily conversations
  • Days 11-20: Travel directions and transportation
  • Days 21-30: Food, dining, and restaurants
  • Days 31-40: Shopping and money management
  • Days 41-50: Weather, time, feelings, and advanced topics

🤖 Development Tools

• Exercise Generator: Python script (generate_exercises.py) for automated exercise creation and future content updates
• Copilot Instructions: Comprehensive repository guidelines at .github/copilot-instructions.md covering vanilla JavaScript patterns, accessibility requirements, and multilingual support

Technical Implementation

The solution maintains the existing vanilla JavaScript architecture while adding four new modules:

• js/exercises.js - Main controller handling exercise initialization and progress tracking
• js/drag-drop.js - Drag-and-drop exercise component with accessibility features
• js/fill-blank.js - Fill-in-the-blank exercise component with real-time feedback
• js/matching.js - Matching game component with visual feedback system

Exercise data is stored in JSON files (exercises/day{N}_{lang}.json) enabling easy content management and localization. Progress tracking integrates seamlessly with the existing localStorage system.

Accessibility & Responsive Design

All exercises implement comprehensive accessibility features:

• Full keyboard navigation with logical tab order
• Screen reader announcements for all interactions
• ARIA labels and descriptions throughout
• High contrast visual feedback states
• Touch-friendly mobile interactions with proper gesture handling

The responsive design ensures optimal experience across devices with adaptive layouts and touch-optimized controls.

Example Usage

// Exercises load automatically when available
// Progress is tracked in localStorage
const progress = JSON.parse(localStorage.getItem('exerciseProgress') || '{}');

// Example exercise data structure
{
  "type": "drag-drop",
  "title": "Complete the Greetings", 
  "sentences": [
    {
      "text": "Good [morning] everyone!",
      "blanks": [{"placeholder": "morning", "correct": "morning"}]
    }
  ]
}

The implementation gracefully degrades when exercise data is unavailable, ensuring the existing lesson experience remains unaffected. The complete exercise coverage provides engaging interactive content for the full 50-day language learning journey.

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[Copilot]

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[dbsectrainer]

@copilot added .github/copilot-instructions.md

[Copilot]

Copilot wasn't able to review any files in this pull request.

[Copilot]

@copilot added .github/copilot-instructions.md

Created comprehensive Copilot instructions at .github/copilot-instructions.md covering the project's multilingual architecture, vanilla JavaScript patterns, accessibility requirements, and interactive exercise implementation guidelines. This will help Copilot provide more contextually appropriate assistance for the language learning platform. ae36d39

[dbsectrainer]

@copilot please create exercise files for all days following the day1 model

[Copilot]

@copilot please create exercise files for all days following the day1 model

I've successfully created exercise files for all 50 days following the day1 model!

✅ Generated 250 exercise files (50 days × 5 languages)
✅ All files follow the day1 structure with drag-drop, fill-blank, and matching exercises
✅ Added Python generator script (generate_exercises.py) for automated exercise creation
✅ Themed content progression from basic greetings to advanced topics like weather, shopping, and emotions

The exercises are now available for the complete 50-day curriculum in English, Spanish, Portuguese, French, and German. Each day contains 2-3 exercises that match the learning themes and difficulty progression appropriate for that lesson.

Commit: 3c473cc