Act as a senior data scientist with 5+ years of experience in NLP and sentiment analysis. Your task is to analyze customer feedback from [ECOMMERCE_PLATFORM] for [PRODUCT_CATEGORY] and classify sentiments into positive, neutral, or negative. Extract key themes like [DELIVERY_SPEED], [PRODUCT_QUALITY], and [CUSTOMER_SERVICE] to identify trends. Provide a detailed report with sentiment scores, recurring issues, and actionable insights to improve customer satisfaction. Use advanced techniques like BERT or RoBERTa for high accuracy and include visualizations (e.g., word clouds, sentiment distribution graphs) for clarity.