Feature 1: AI product storage/shelf-life hint
- New API: gemini_product_hint → {location, expiry_days, reason}
- After opening the add form, Gemini suggests optimal storage and expiry
- Shown inline next to expiry estimate as a subtle AI badge with tooltip
- Also updates location buttons if AI suggests a different location
- Cached permanently in food_facts_cache.json (per name+lang)
Feature 2: AI-enriched shopping suggestions
- New API: gemini_shopping_enrich → adds tip field to each suggestion
- After bring_suggest renders, Gemini adds practical buying/storing tips
- Tips shown inline under each suggestion item in indigo italic text
- Cached per item list + lang in food_facts_cache.json
Feature 3: AI anomaly explanation
- New API: gemini_anomaly_explain → plain-language explanation
- '🤖 Spiega' button added to anomaly banners (when Gemini available)
- Explains in 2-3 conversational sentences why the discrepancy likely happened
- Replaces technical banner detail text with friendly explanation
- No caching (anomaly context is always specific)
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