Create interactive weekly training plan (max 14 days) with drag-and-drop class cards and rest days. Shows calendar with day labels, class details, and "Add to calendar" button. MUST call search first to get class indices. Use index from search results for workout days. For rest days: set isRestDay=true, omit index. Each day needs ISO date (YYYY-MM-DD). Invalid indices become rest days. Never construct or guess index numbers.