Add Progress Analytics with Visual Charts

[dbsectrainer]

Description

Create a comprehensive progress analytics system to track and visualize learning progress with charts and statistics.

Features to Implement

• Progress Dashboard: Visual overview of learning progress
• Charts and Graphs: Display learning statistics with visual charts
• Learning Metrics: Track days completed, words learned, review needs
• Streak Visualization: Show learning streaks and consistency
• Performance Analytics: Exercise accuracy rates and improvement over time

Technical Requirements

• Use vanilla JavaScript with HTML5 Canvas or SVG for charts
• All data stored in localStorage (offline-first approach)
• Responsive charts that work on mobile and desktop
• Lightweight chart library or custom implementation
• Export progress data functionality

Charts to Include

• Daily/weekly progress bar chart
• Learning streak timeline
• Words learned per day line chart
• Exercise accuracy pie chart
• Lesson completion progress circle
• Monthly progress heatmap

Acceptance Criteria

• Progress dashboard page implemented
• Multiple chart types for different metrics
• Real-time updates based on user activity
• Mobile-responsive chart design
• Progress data export functionality
• Historical data visualization
• Performance comparison over time
• Integration with existing gamification system

Priority

High - Essential for user motivation and retention