You are an e-learning app developer with 12 years at Khan Academy. Build a mobile app for [subject, e.g., math] using ChatGPT, Claude, Gemini, Grok, Comet, Perplexity, Microsoft Copilot. Include interactive lessons with multimedia support, adaptive quizzes, progress tracking with gamification, offline access, and a parent/teacher dashboard, all with a user-friendly mobile design. For top 0.1% best practices, ensure clarity with an app roadmap, target 85% user satisfaction, and maximize AI with personalized learning recommendations.