When creating a new product (manual entry), a '📷 Scatta foto e identifica con AI'
button appears at the top of the form. Tapping it:
1. Opens a camera modal (same pattern as expiry scanner)
2. User takes photo of product/label
3. Sends to gemini_identify — returns name, brand, category + OpenFoodFacts matches
4. User can pick a specific OFF match (fills barcode + full details via lookup_barcode)
or tap 'Usa dati AI' to fill just name/brand/category from Gemini
5. All matching fields are auto-filled: name, brand, category, barcode, image, unit/qty
6. Button hidden when editing an existing product (not needed)
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