Feature/ai study progress analytics dashboard

[KolaSailaja]

📌 Description

This PR implements the AI Study Progress Analytics Dashboard feature, providing users with a centralized view of their learning progress, study activity, and AI usage.

✨ Features Added

• 📊 Comprehensive study analytics dashboard
• 🤖 AI Tutor conversation statistics
• 🃏 Flashcard usage tracking
• 📅 Study plan progress and completion metrics
• 💳 Remaining credits and credit consumption analytics
• 📈 Daily, weekly, and monthly learning activity
• 📚 Subject-wise progress visualization
• 🕒 Recent study sessions timeline
• 🔥 Learning streak indicator
• 💡 AI-powered study insights and recommendations
• 📱 Fully responsive dashboard interface

🛠️ Technical Changes

• Added analytics dashboard components
• Implemented dashboard API endpoints
• Reused existing Supabase authentication and utilities
• Added reusable charts and statistics components
• Implemented loading, empty, and error states
• Optimized data fetching and dashboard calculations

✅ Testing

• AI Tutor statistics
• Flashcard analytics
• Study plan tracking
• Credit usage analytics
• Subject-wise progress
• Recent activity timeline
• Learning streak calculation
• Responsive dashboard layout
• Authenticated user access
• Error and loading states

Related Issue

Fixes #80

[vercel]

@KolaSailaja is attempting to deploy a commit to the vishwamistrylearning-1037's projects Team on Vercel.

A member of the Team first needs to authorize it.

[KolaSailaja]

@MistryVishwa Could you please kindly review this pr