✨ feat: add live learning tracker with AI explanations

[Anushka-045]

📌 Closes #8

🚀 What this PR adds

A live web tracker that auto-syncs with this repo and shows DSA
learning progress at a glance.

✨ Features

• 📊 Stats bar — total programs, topics covered, topics remaining
• 📈 Progress bar — overall DSA coverage percentage
• 🗂️ Topic cards — files grouped by topic (Conditionals, Arrays, etc.)
• ✅ Done badges — completed files shown with ✓
• 🔜 Coming soon — planned files shown as placeholders
• 🤖 AI explanations — click any file for a beginner-friendly breakdown
• 🔄 Auto-sync — pulls directly from GitHub API, always up to date

📁 Files changed

File	Purpose
index.html	Main tracker page
style.css	Styling and animations
app.js	GitHub API fetch + topic rendering
gemma.js	AI explanation logic
.gitignore	Excludes config.js (API key safety)

🔒 Security

config.js (API key) is excluded via .gitignore — never committed.

🧪 How to test

1. Clone the repo
2. Create config.js with your OpenRouter key
3. Run python -m http.server 8080
4. Open http://localhost:8080