feat: AI suggestions, smart shopping qty, shelf life fixes, UX polish
- bringSuggestItems(): Gemini AI for seasonal/complementary suggestions (6h cache)
- renderSuggestions(): AI badge (🤖 AI) for AI-sourced items + CSS .priority-ai
- smartShopping(): suggested_qty/unit/approx with package-aware tiers
- autoSyncUrgencySpecs(): sync suggested quantities to Bring! spec field
- estimateOpenedExpiryDays(): dairy-outside-fridge rules (panna 3d, yogurt 2d, latte 1d)
- AI shelf-life upper bound tightened to max(rule×4, 30) days
- Opened section: fix 0g display (remainderAmt >= 0.5 threshold, pkgSize guard)
- guessCategoryFromName(): expanded with 50+ new patterns (uova, herbs, vegetables...)
- Suggestions panel: excludes already-added Bring! items
- Shopping list: no re-render while suggestions panel is open
- Translations: remove duplicate 🍳 from dashboard.quick_recipe (all 3 langs)
- Scale icon: always white via filter:brightness(0)invert(1)
- opened_shelf_cache.json: remove 3 bad dairy entries (60d outside fridge)
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