- Replace simple bar chart with full Anti-Waste Report Card
- Grade system (A+ to D) based on user's waste rate
- Dual comparison bars: user waste rate vs national average (IT/DE/US)
- Estimated monthly savings in money, meals saved, CO2 avoided
- 3-month trend mini chart with colour-coded bars
- Backend: getStats() now returns 3×30d buckets (used_30d, used_prev_30d, used_prev_60d, etc.)
- Real-world benchmarks: IT 22%/5.4kg/mo (REDUCE), DE 20%/6.5kg/mo (Eurostat), US 30%/9.2kg/mo (USDA)
- All labels fully i18n: 18 new antiwaste.* keys in it/en/de translation files
- Section is fully JS-rendered; HTML now just an empty container
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