feat: Info tab enriched — retroactive AI estimate, annual totals, inventory & activity stats
api/index.php:
- gemini_usage: retroactive AI call estimate from cache files (price/shelf/category)
with per-entry token estimates (price ~475tok, shelf ~580tok, category ~230tok)
- yearly totals: sum tracked months + retro estimate for full 2026 view
- DB activity stats: products, inventory, transactions, expired, expiring_soon
- cache stats: price (255), shelf (30), category (7), foodfacts (10)
- system info: last backup timestamp+size, Bring! token expiry
- new constants: SHELF_CACHE_PATH, FOODFACTS_CACHE_PATH, BRING_TOKEN_PATH
assets/js/app.js:
- _renderInfoTab(): full rewrite — 4 cards (AI, Inventory, Activity, System)
- month displayed as localized name via Intl.DateTimeFormat (es. 'maggio 2026')
- tracked section shown when calls > 0; retro estimate always shown if gap exists
- year section: tracked + retro combined total
- pill() helper for consistent stat display
index.html: 4 cards with ids info-ai-content, info-inv-content, info-act-content, info-system-content
translations: updated settings.info.* keys in it/en/de (overview subtitle, retro labels, inv/act/system keys)
dadaloop82
cc0d9763ed