1. AI photo scan: searches local DB for matching products and shows
'Già in dispensa' section before OFF matches. User can tap an
existing product directly. 'Non è nessuno di questi' button for
new products.
2. Scale live box: when product unit is ml, shows hint
'Peso in grammi → verrà convertito in ml' so user knows the
gram reading will be converted.
3. Scale auto-fill: ignores stable weight if it differs less than
10g from the last confirmed reading. Prevents re-triggering the
same weight when switching between products on the scale.
_scaleLastConfirmedGrams tracks the last auto-confirmed weight
and resets on page navigation.
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