fix: reduce finished-banner to only products with unexpected zero balance

Of the 75 qty=0 rows restored in previous commit, delete the 66 where
total_in - total_out <= unit threshold (legitimately finished by user).
Keep only 9 products where transaction math says there should still be
stock but inventory hit 0 (likely system/scale error):
- Latte di Montagna (0.41 conf)
- Passata di pomodoro (692g)
- Carote (80g), mele (6pz), Uova biologiche (1pz)
- Cipolla dorata (496pz), Panna da cucina (0.6 conf)
- Gran bauletto integrale e noci (448 conf), il tuo muesli mountain (331g)

These 9 will appear in the banner asking user to verify.

data/anomaly_dismissed.json

@@ -0,0 +1 @@
+{"a_32_572":1776776330,"a_17_171":1776776404,"a_25_-777":1776776427,"a_7_-279":1776776434,"a_168_253":1777223925}