I need a developer to build a Version 1 (MVP) of a simple AI-powered language learning app. The core feature is a chat-based AI tutor where users practise one language through open-ended conversation. The tutor should respond naturally, provide basic corrections and explanations, and keep the conversation going. The MVP should include: - A basic chat interface - Simple user accounts - Basic saving of words or phrases from conversations - Clean, minimal UI Details, scope, and milestones will be confirmed before starting.