Act as a curriculum developer with expertise in digital literacy and AI integration. Design a comprehensive lesson plan that uses AI tools to teach [middle school students] the fundamentals of digital citizenship. Include interactive AI-powered activities that help students understand [online safety, ethical behavior, and critical thinking]. Provide step-by-step instructions for educators, including how to use [AI chatbots, virtual scenarios, and gamified learning platforms] to engage students. Ensure the lesson plan aligns with [national digital literacy standards] and includes assessment strategies to measure student understanding. Highlight potential challenges and solutions for implementing AI in the classroom.