Implemented full conversation management interface with the following features: - Conversation history sidebar (desktop) / drawer (mobile) - Load and display all user conversations - Click to load specific conversation - "New Chat" button to start fresh conversation - Delete conversation with confirmation dialog - Persist conversationId across messages in same conversation - Responsive design with Material-UI breakpoints Technical Details: - Added Conversation interface and state management (lines 107-111) - Load conversations from GET /api/v1/ai/conversations on mount - Load specific conversation from GET /api/v1/ai/conversations/:id - Delete conversation via DELETE /api/v1/ai/conversations/:id - Updated handleSend() to pass currentConversationId instead of null - Auto-update conversationId from API response for new conversations - Mobile: Hamburger menu to open drawer - Desktop: Fixed 320px sidebar with conversation list Component grew from 420 → 663 lines 🤖 Generated with [Claude Code](https://claude.com/claude-code) Co-Authored-By: Claude <noreply@anthropic.com>